I hope this will help you a lot.
https://www.wsj.com/articles/bitcoins-future-heres-what-you-should-know-1509475884
The futures contract mean if you are betting on the price of the bitcoin will reach based on your prediction. That means if the price of the bitcoin will be more than your predictiona dan let say if you are predicting about the bitcoin will reach $8000 and if the price of the bitcoin will be more than $8000 let say about $8010 and you will get $10 based on the gap between your prediction and the price of the biitcoin.

What do you mean about the actual use? To determine those coins which already had the actual use will a bit difficult. I'm not sure about the playkey project but i just believe about the spectre.
You can try to see about the santiment and various platform which already had actually used. Eidoo should be another choice.

Not sure there is a problem need to solve but the cartaxi was aiming to be the competitor of the uber or its based on the navigation for the real usage to find the taxi service. I meant about the cartaxi service will be similar just like uber, but it doesn't make sense to claimed about the cartaxi to be the decentralized at the same time and where is the implementetion of the its decentralized?
Pretty odd.

You can try to diverse some of your portfolios with altcoin, This seems to be a good time to buy altcoin because the price fo bitcoin always increase any time. As you can see a lot of the altcoin gets rekt due to a lot of demand are going to the bitcoin, but remember to put some of your amount in the bitcoin to give you the more guarantee about your portfolio.
You can try this in your portfolio.

Fiat currecy just a tool by the goverment to control the financial and economic sector. About the future of the fiat that can't be determined caused by the fiat depends on the goverment itself.
The government has used the polics issue to manipulation the fiat money, the government can print it anytime.
Bitcoin was very different with the fiat money.

The goverment was building the centralized thing that gives the goverment ability to control it. the bitcoin based on the decentralized system which means the bitcoin will be so difficult to be controlled by the goverment. The fact that the government must try to change its mind set about the centralized and try to understand about the decentralized thing.
That's why the goverment against the bitcoin.

About claimed to be the fastest platform and it was not actually true, while you are seeing about other platform just like bitshares and the developer of its platform claimed has less than 2 second. and that will be more faster rather than the universa. But i can't say every ico that claimed to be the future of the smartcontract will always be succeesful.
Neo was offering the new thing about the pos system. But universa seems legit

And every satoshi will worth a lot in the future, if the more unfamiliar people will try to join in the crypto and try to adopt the bitcoin and the bitcoin will have divided into a little part. and so you can see the price will worth a lot in the future.
This time adoption already come to the bitcoin and just waiting for the result about that.

1 If the bitcoin becomes a bubble and burst. This will be linked to the flash crash but this time that looks impossible.
2 If the exchange site will be banned in the various country because of the exchange site as a centra key in the bitcoin or crypto.
3 Too many hackers, scammers in the crypto.

A lot of the things that makes me fear about the bitcoin itself. But the politic and regulatory seems to be a serious thing rather than other.

After the bitcoin cash hardfork the altcoin was really stable, as you can see about the fork becomes a trend in this time rather than altcoin. because if you are holding the more bitcoin and you will receive free cash and can you tell me about someone didn't feel happy or interested to get the more free cash from the bitcoin itself? And that's free, you just never do anything.

I don't think se, because the fact that the ethereum price gets decrease a little bit due to the bullish trend of the bitcoin, I just think about the more people are focussing into the bitcoin rather than ethereum itself. This time the ethereum trends lost to the bitcoin hardfork trend which generated the more coin everytime from bitcoin hardfork.
You can watch the discussion.

You may wrong about that, in my opinion about the main factor to creates a lot of the new international job it was the blockchain, The blockchain can be considered to change the financial structure to minimize the cost and the important thing about a lot of the big company are looking for the blockchain expertise. Bitcoin as the currency gives a little impact into it.

That depends on the developer's decision about when to distribute the airdrop into the participate, as you can see about the airdrop already scheduled. And i think that you must try to read the more information regarding what the airdrop that you already signed in. And so you can try to see the exact date of the airdrop distribution.

That means the definition of the bitcoin that has created by satoshi nakamoto already changed for some people's mind, Bitcoin mainly considered as the investment rather than future mainstream payment.
The fact that the bitcoin can't compete with the visa scalable.
The more people are knowing the bitcoin as valuable investment because the supply was limited.

As long as the OP is still beliving about the future of the bitcoin and we will never think about too late to buy the bitcoin, The sky is limit and bitcoin was different with another currency that pegged on the stable value by the regulators.
bitcoin goes with its environtment and never try to pegged with anything especially to the regulators itself, What will be happening if the bitcoin wroth over $10k and this is not too late to buy bitcoin as much as you can.

Where are you getting that statement? Have you done a research about that? Have tried to do a mining calculator and then try to calculate with the electricity cost in your country? it seems still profitable this time. Mining bitcoin will give you a better ROI than mining altcoin use your GPU rigs. You can try to do a comparison through the mining calculator.

Bitcoin already lost some hundreds thousands in this time if we are calkculating all of the bitcoin that lost due to the various reasons. The miner still run the nodes but they will not receive the more bitcoin reward from the block again. They will depend on the transaction fees to keep their nodes still run to secure the network of the bitcoin itself.
No reward in every block, that means the bitcoin arleady reached the total supply.

Because the more supply will come to the market and just dump it to run away with money from the market, Doge will turn into another zombie or even die token in the future.
As you can see the inflation doesn't get control by any party and the developers already gone.
There is no hope to the dogecoin to get the bright future.
There is a lot of better coin rather than doge.

But i will not choose once from your list, As you can see a lot of platform are in competition to develop eht future platform that gives you true decentralization, high privacy and anyone will not able to trace your transaction. And the last will be scaling solution, that means if the network will not so easy to be bloated caused by a lot of the trasaction already made by thousand or million users.

It caused by the next fork of the bitcoin, i remember about in the next month the bitcoin will issue the new cryptocoin to be the next fork just like bitcoin gold. B2x coin will make a lot of altcoin holders are scary.
The more people will try to buy bitcoin, i believe in the next week we will see another hype just like what already happened with bitcoin gold hype.
$7k becomes real.