You really think so? I doubt that because something like Ethereum can't die because it's the mother of all smart contract on the blockchain, I know many alts are whacked nonsense but if Bitcoin goes down its true it will affect the whole market but some altcoins will survive, there is one thing I like about blockchain and crypto, they have their different fields of niches, Litecoin and dogecoin will still survive without Bitcoin, if I can erase Bitcoin right now, more money will escape from Bitcoin and flow into other.

I am a big fan of Bitcoin still but every projects have their disadvantages too, you and I know that Bitcoin is not perfect in every way, some projects exists to continue from where Bitcoin left off.