why do you even insist on separating the two from each other?
it is like asking which one would survive longer, cars or combustion engines! bitcoin is based on blockchain technology and it is the one that introduced it to the world. bitcoin is also the one that is improving this technology and as the technology grows bitcoin grows and vice versa. they are not separate, they are one thing.
of course bitcoin can't die, because all altcoins have standard bitcoin prices, so if bitcoin goes down then altcoin prices will decline, altcoin will be based on blockchain technology, the first technology to make bitcoin, so all altcoins are from bitcoin, bitcoin is like all altcoin ... and the blockchain is a system for making bitcoins when the blockchain is dead then automatically bitcoin and all altchoin will die too ...