I do not think so, bitcoin users will divert to a better altcoin. we all know that many of the weaknesses of bitcoin are found after 9 years, other issues such as segwit are also things that make users confused.
It is not as easy, if bitcoin disappeared the amount of instability that will hit the markets will be enormous, something like we have never seen, think about this, people panicked with the crash a few days ago, what do you think it is going to happen if bitcoin really died? The crash will kill most altcoins too since everyone will want to withdraw to fiat almost immediately and no one will want to be left with a bag of coins.