Bitcoin has made a huge mark with cryptocurrency that it may be impossible to be obsolete. However, it may be possible if there were more digital currencies that thrive.

Anything part of the internet can be hacked. However, if the system have securities and protection, like what Bitcoin do, then it will be a bit harder to do so.

Bitcoin futures contract is securing a number of btc that you want to use. You benefit by buying them for less compared to how they value later on.

It sounds possible, but this also seems less likely. This is due to the need to observe the law of supply and demand. As much as possible, a balance should be established and that is usually better done by humans.

Currently, bitcoin is the biggest cryptocurrency so far and people have been very interested in it. Since there is the interest coming from the people, this increases the market so the value of it goes higher.

Yes, bitcoins is only limited to 21 million, but even so the price value of it is unrelated to the amount to the total bitcoins there is, so you can only have 1 bitcoin but may mean you are actually holding $20,000, so no real issue about it having a limit.

Although bitcoins certainly has been growing in popularity, it is still a gamble to invest on it, if you do then you should make a back up plan just in case. A good advice would be to keep your job as it is sustainable.