It is possible for bitcoin to survive after a 100 years because bitcoin right now is in it's prime time because the value goes up and down and that is what we need to make ourselfs some money. If you invest the right time you will make money.

I think you are a little bit wrong because bitcoin won't really replace a lot of banks i think that bitcoin will become one of the main banks.
And keep living for a long time but eventually die out.

It is very greedy but i think that is what we all are because we all are here because we need more money and greeded by putting our lives on the line by buying bitcoin and now we are here with a lot of profit and a big smile on our face.

Yes because bitcoin has gone from 1k in the begin of the year to 7k. Witch is insane and the bitcoin is still rising. and at the end of 2k17 it may even reach 10k. So there is still time to buy yourself some bitcoin to make yourself some money.