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.
from my views and experience people will not lose the interest but if people will lose the interest because of their lack of knowledge about bitcoin but after get knowledge about bitcoin they will again taking interest in bitcoin . There are so many reason why people take interest in bitcoin but there are no reason why people
Will not take interest in the bitcoin. The most important reason why people take more interest towards the bitcoin is people earn the lot of money in short period of time.