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.
all cryptocurrency is interrelated, so the whole cannot be separated, because all use blockchain technology, so it will not be able to drop each other, bitcoin uses blockhain technology, like bitcoin is a content, and blockchain is the container,