Btc survival depends on the acceptance of people, in my opinion I think it will not disappear, because more and more people are entering the world of BTC.
Hinestly speaking no one can say when or how long bitcoin will survive becuase as long as it has a value it will be there. If people continue using it then it will continue to survive. If I were you i might think about the positive thing about it, as see see right now bitcoon gain more popularity so I think it can survive always. It was not that easy to kill bitcoin in fact.