I think bitcoin will always survive for a long time when there are many people still believe it. As we think that the widely acceptance of this digital currency is increasing day by day.
lettering and money = blockchain and Bitcoin
But I can't tell you how long Bitcoin will survive. Maybe forever.
will last forever if developers are able to continue to innovate, in the free market, innovation is everything, the second is government intervention, it is not owned by bitcoin and they are very unique because everything is charged by the market and loyalists so that users can move along with the technology competition developing.