The problem here is in that we didn't separate the notions. Hence we have to mention that there is difference between 1) situation, when you can afford to lose money, but actually you more need them for something else and 2) situation, when you can afford to lose money and you can throw away any amounts of money. The latter situation is a bit idealistic, because everyone actually can spend money for something better that gambling. However, if person thinks that he/she has an unlimited amount of money, then gambling is worth playing. Nevertheless if person always can spend money for something better, he/she more should play gambling for fun or maybe just do something else.

I think it is impossible to mine all the bitcoins really fast. It is going to take 150 years as far as I remember. At that time there might be no China or it may end in crisis. So, bitcoin is not destroyed and everything is going to be fine. And even if China would mine the rest of bitcoins, so what? Why do you think that this is the end? People will just buy them for dollars and bitcoins will spread around the world.

I don't think that Bitcoin really depends on other currencies. Even if there was only Bitcoin and no other currency in the world (which is absolutely impossible) it could still work as money. People would use it in their everyday life and it will be totally okay till there comes time of crisis. A war, for example. And then people will return to barter and no money will be needed at all, because they won't need it.

It sounds true that 21 million is not enough for billions of people. However, I think that is the reason why the price is going to increase enormously and people will actually use thousands of satoshi and 1 bitcoin will be something that only millionaires have. And of course I think that Bitcoin will not stay alone. Litecoin and other alt coins are going to join it.

It sounds sad to admit it but for me it is quite the same as OP says. Bitcoin is a source of money. Important source, of course. So in a way I do care about it. But what I need is money for which you can rent a flat, buy some food or tickets for a train. If something becomes more profitable than bitcoin - I will move to that currency. Sad but true. I don't know those who really care about bitcoin.

I think that it is very likely for us to see 700$ the next October. After a halving the price became about 500$ but now it grows quite fast, so if nothing unexpected happens then bitcoin will reach 700$. In fact, I think it will be closer to a 1000$. However, it is not that easy to predict the price. I think it can go down for some years, because mining won't be profitable.

I think Bitcoin is not going to die. Yes, it is harder to mine Bitcoins as the time goes and the amount of them increases. Nevertheless, in my opinion, the price will increase as well with time, because people will start to realize that there is only a limited amount of bitcoin, so they better get some. So, my guess is that it will last for 50 years more at least and is likely to last even for 200.

No, experience doesn't matter in such gamling as dice or roulette since it depends not on personal traits and skills of human, but on a chance. And in front of chance any experience or skills are not working. The latter more likely could be lucky fall within a chance in some cases. But actually it is not the law that experienced gamlber will always be winner. Absolutely no. In one cases chance can give, but actually it can easily take away that it gave.

Martingale works actually. But in a very stripped-down version.
It could work, if we had an unlimited amount of money. Then any losses would have it wins to compensate as well as opposite. So it would be eternally jumping from one extreme to the other and in a result it would be complete zero. And zero isn't nothing, it means total equality of extremes (on the middle between absolute loss and absolute win).
But in real life we have only limited amount of money. So any jumps between extremes will be finished in a result with one of the two extremes. The goal of gambler is to end with win, not loss or 'zero'. However, that understanding of martingale is perverted, as actually it should ideally always give the same amount of money as at the start. Hence, it works, but to 'zero', which is neither win nor loss.

If Bitcoin became one million $ then I'll buy myself a flat and I'll buy a flat for my great professor. If it stayed where it was or hit 1000 than I would like to give the money I earned to my children. I am planning on keeping some money I am going to earn here within years and then give it to my kids when they grow up (turn 18).

What is wrong with transactions? Are there any faster transactions than Bitcoin ones? I am not sure whether it is the same to everyone.. Maybe it depends on the amount of money or something else, but my transactions take about a minute or two. Why is it that I see people often complaing that transactions are not fast enough?

Well, sounds quite nice and funny. But a hodling person might end with lot's of bitcoins but no use of them, because one day it might be not that easy to exchange them to dollars.
And I guess people who buy some old tables, wardrobes and all that don't really know about Bitcoin.

Eat 100 bananas sounds nice to me But if to be serious, I think I will just spend a few hours contemplating and trying to think of my possible further options. I have about 10$ in Bitcoin now, so it won't really be a huge loss for me. I guess I'll try to move onto litecoin then or something else which is strong and popular.

IMO, gambling isn't wrong. As well as any other thing of human life isn't wrong. To be more precise, it can be as wrong as right. It mostly depends on humans. Things have no their will, people have one, which can be good or bad.
Hence gambling (or any other thing) could be wrong, if it is done by a person with bad (perverted, nonrational) will (for instance, nonrational will of gambler leads to losses and addiction). Could be right, if it is done by a person with good (health, rational) will (rational will saves fun and game character of gambling). Also it could be neutral, neither right nor wrong, if it has no relations to human (or to some human from his/her position).

Bitcoin and my country is a sad story. I guess of all the people I personally know only about 5 use bitcoin. Another 10 might have heard about it. I am not sure for what they use it but unfortunately it is not really possible to use it for many things here. Exchanging it is a hard thing and of course very unprofitable. There are no banks, institutions or shops which accept it. I think bitcoin is out of the law here. Not in the sense that it is forbidden but in the sense that it is not mentioned anywhere.

Okay, we understand that Bitcoin is unstable and that it used to be 10$ and 1000$. However, I don't think there are many people who believe that Bitcoin will cost more than, say, 1000$ in 10 years. I don't believe it as well but I hope that you are right in your predictions 

My goal is to earn about 150$ BTC, so that I could rent a flat together with somebody. I haven't reached even this goal but I think I might get close to it some day. I am not intending to become a USD millionaire. I am just a person from a poor country, so I want to have money to be able to live a normal life and partly this money can be earned in Bitcoin.

I don't think Bitcoin is able to replace dollar. At least, not in 15 years or so. American dollar has more than 200 years of history. Of course, our world is changing faster and faster. Maybe, Richard Avenarius was right that people optimise knowledge and method of cognition, so that development fastens. But still, 15 years won't be enough.

I think that kids are getting smarter and smarter. A three-year-old child can make photos and play games on iPad. For children nowadays there is no much difference between paper money any any other kind of money. They see that money can also be on a credit card. And maybe it is just not necessary to explain to them in which ways is Bitcoin different from credit cards as long as they can realize how to use it.

The rules I propose sound like this:
1. Set limit on days and hours per days before starting to gamble.
2. Set the strict sum of money you are going to use during gambling.
3. Once you win - always withdraw the money you just one.
4. Never try to explain yourself that in this situation it is okay to break one of the rules above.