If bitcoin dies, then the entire cryptocurrency market will disappear. In my opinion, it should be. If bitcoin is 0, all tokens should be 0.
Disagree. Currently bitcoin has nearly no use besides being an exchange for alts. Alts such as Ethereum, Monero and others have some use. I can see them surviving if btc dies.
if you think that then it means you have never used any of these coins apart from buying/selling them on exchanges, or probably you have no idea how these cryptocurrencies work.
and you chose the worst two coins for your examples. if you chose anything else it would have been harder to argue, but when it comes to these two it is easy because they both have
proven scaling issues worse than bitcoin.
in other words if 10% of bitcoin users start using any of these coins the backlog that will be created on them will the exact same scenario that is currently going on with bitcoin: high fees and slow confirmations.