As long as there is someone who continuosly supporting bitcoin it will still remain. It will continue to work and its price will continuosly going to increase. But I have a doubt. Bitcoin is decentralized. Anytime it can vanish since they do not care about the rules and regulation since no one controls it. So they can vanish whenever they want.
Bitcoin is decentralized not for getting vanished rather to stay out of control of corrupt people. Bitcoin will never vanish as it is giving huge profits to masses and its support is increasing on daily basis. Bitcoin has yet not been legalized in majority of the countries which means it has yet not bloomed at peak. Before becoming legalize all over the world, I strongly believe it is not going to disappear at all.
It has not legalized anywhere because governments are afraid of this currency. If it would be legalized, people will adopt it freely everywhere and this is what threatening authorities. Because this will take the control out from their hands and they will lose their power and status. No government is ready to do that and people will continue to adopt this because it is a great platform for them.