First thing, bitcoin can't die overnight.
Second, people are getting crazy about all cryptocoins not only bitcoin so this trend might remain same if there will be no more bitcoin.
People are investing in bitcoin because it has limited supply and no any government can shutdown bitcoin network. People find it much safer to store their wealth in bitcoin than in their local banks.
And also they cannot recover for their loses if they quit interest from crypto.
Too many people getting out so when bitcoin died, we can call it for another name, the bitcoin was only died in that thing but the thing that worked by bitcoin was still alive.
The bitcoin cannot died unless no more person use this or no one want to use this and if it is useless for the society.