Bitcoin could die if there is no one left who uses it. Until at least one person uses it, Bitcoin can't die. So obviously Bitcoin never die 
Of course that is not true. Bitcoin would probably die if there will be just a few users, like 10 to 100, if they are not having the complete sum of bitcoin and making it circulate between each other. And even if they keep circulating it it wont have the same value. Where will they spend bitcoin if they are the only users of it? Complete world is not using bitcoin and just a few of them are doing, and bitcoin would start dying from price day by day as there will be no demand and supply at all.