So it will be problem and problem....and trust gone. Remember, bitcoin value only about trust and faith. If this keep happening, people wont use it anymore and decrease value.
Not everybody use bitcoin with huge transactions. Often they use to send 300-1500$, which it doesn't make sense to spent 15-50$ on transactions fee. And they have to wait few hours or days to get their transactions confirmed...
Except there no alternative, yet.

If you are asking if you could pump or dump the Bitcoin value then the answer is no. 10 BTC is quite a lot but it is still too small amount to be "a big player". However, in the next 10 years 10 BTC will be quite a lot and not many people will be able to trade such huge amount of BTC.

That would be really great moment for bitcoiners, because we would have one globe and one currency.
Transactions would be faster because blockchain technology is faster than any other banking system.
But tbh this is hypothetical answer which i gave, because bitcoin is decentralized currency.
" if no one has control over it than how it could be legal currency"

I think not all Asian countries assume that bitcoin is illegal, if we look at the role of japan and china that have a big role on bitcoin because it has many users doing business in bitcoin, is the country illegal bitcoin?
and the legality of bitcoin is determined by the policies of the respective state governments.

Besides profitable, of course bitcoin makes it easy to do various financial transactions or business transactions, but for now almost all users use bitcoin to do various business like trade and investment even some of them use to gamble but i recommend. Not to gamble and try to use bitcoin wisely like trading and investment of course this will be more useful and profitable for you.

Although all possibilities can happen to bitcoin, but I'm not sure there will be altcoin that can replace the function and role of bitcoin as a source of digital currency trading.
And so far the contribution of bitcoin is so great for advancement of cryptocurrency that it attains popularity and also high confidence from all walks of life in different countries.

I think one of the simplest ways to allow your Bitcoins to grow when you're just starting or new to its platform is by joining signature campaigns. Since I am not so familiar with Bitcoins yet, I am here in the forum reading about how this goes and I noticed that most of the contributors here are members of different signature campaigns. It may take time and a need for intellectual investment in order to write something meaningful that will be paid by the signature campaign in exchange, but I think little by little its a way of earning in a simple manner. Afterwards, trading and buying can be done when one has saved up enough Bitcoin to do so.

If there is any country that is very complicated and can go to any length to get convictions even to the extent of another country, its the United States and even if I happen to create a service in the crypto world, I am sure to exclude USA citizens because I don't have money to pay lawyers and then being offered a deal to plead guilty over something you probably don't know exist in the first place but that's definitely no excuse to the judicial system for whatever reason.

Depending on your product or service, eg. whether it’s an access “Token” for a product or service, or a “Coin” for a security offering, you will need to know how to choose a facilitative jurisdiction and corporate formation for your project.

Regulation will be coming.

But it will be a good thing, IMO.  It will legitimize the currency, end differing definitions of what Bitcoin "is" at various regulators, and probably put in place a framework for ICOs that balances the innovative financing model with some level of protection.  They're also looking at chartering limited purpose Federal banks for crypto exchange businesses, which might sound scary but the reality is they would be a big benefit in legitimizing the business model without having to go through the 40+ states that require money transmitter licenses.

Some regulation is necessary for widespread, mainstream trust and acceptance.  Which seems counter-intuitive to some extent but that's the fact of the matter.

I see a lot of people giving a lot of suggestion for different ICO. So instead of telling you what ICO to go for, i shall give you a warning. Although these 2 month can be considered to be the ICO period, but not every ICO can a profit. There are some tokens that become great profit after the end of its ICO. But these trend may not continue for long as of right now, as people start to realize that not every ICO can be the next Ethereum and there is more focus on fork.

I think the biggest thing for people is security. If you go out and talk to a lot of people however, they dont want to be liable for their security. They want a business to keep up with the security and protect their assets. Which is why I think coinbase is going to be a very old company some day. For a lot of people that may want to invest and safe coins for their children, making a Coinbase account and securing it will be the best way for them to save the coins for their children since you just need very simple information.

Remember the same was said about Bitcoins in 2009 when it was trading below $300.00 . Yes all altcoins are worth buying. I prefer ICO and resell immediately it goes to market. You diversify  by spreading your buying over several coins, hold till 2 years time and resell. If you are lucky the ones that appreciate will outnumber those that seems scam or worthless.

It will still alive and will getting stronger, some of the investors prefer to put their money on eth because the price is not too high and there are so many project related to eth, eth got a slow movement but stable, eth has grown into one of strong alt coin and it is a good coin for long investment

There are not good icos at the moment, a lot of them are becoming scam projects and they dont even guarantee to give their investors their money back if the projects does not succeed, that is why i would never invest in an ico at those moments. The only ico that i trusted atm is AION, very underrated project.

I've never bought anything on the dark web.  I've never even used or seen what's there.  I'm aware that TOR exists, but that's the extent of my knowledge of such things.  Been down the drug use route before and have no plans for that again, or anything else that's illegal.  Bitcoin makes buying illegal things quicker, but I don't think it makes it any safer for the buyer.  You'd be much better off paying with cold, hard cash.  That's probably not possible on the internet, but you know what I'm saying.  Cash is way more anonymous than bitcoin.  The police would be able to trace you somehow, believe me.  Plus if you got the postal service involved, yeah.

It isn't according to the law!
They are asking you to pay income tax and they don't care what gave you this income, they just want the money. That's why the law states what it states.
According to the tax law, that is basically the same for every country, even if you get cash for mowing your neighbor's lawn, or find money lying on the side of the road, you are supposed to add it to your yearly income and deduct the tax. Nobody does that, but that's what they'd like you to do.

In actual this is the common thing in the bitcoin and altcoins field with combination of increase and decrease .
Here I myself have making investment in the bitcoin and also in the altcoins , Because I know that the price of the bitcoin going small small down but this is the first of the time when it is getting down after big pump , so it will once increase for small time , now next we can see that the price of the bitcoin if will go more and more down then surely if I have investment in the altcoins than I will make earnings in the altcoins more and more because with the down in the price of the bitcoin , the price of the altcoins will get up easily .
So here I  am doing both the work of buy bitcoin and altcoins , in small small amounts with every pump and dump .

The personal lending and information stored such as credit is a very interesting idea because it already replaces so many other ico's in the market right now. So much potential with this one. Everyone saying it's too early, but it's always early especially when bitcoin AND ethereum both came out. Heck, the idea of ethereum was on a whitepaper lol.

ICO is different from crowdfunding or IPO.

Crowdfunding or IPOs are regulated by most countries which impose restrictions on who is allowed to fund or how much they are allowed to contribute.
ICO is unregulated. It was born to bypass the regulations. People can invest as much as they want. Everyone can raise money by issuing cryptocurrency. There is no need to have developed products. The only you need is ideas. And you can raise more money than Crowdfunding. Investors  often don’t have any right to the company. So there is no protection. It is often considered as a crowdsales (their products are coins. So for tax purpose, they will be taxed, proceeds from IPO are not taxed).