With ethereum being the backbone of DeFi, NFTs and other countless Altcoin projects, if it happens to disappear tomorrow, which Altcoin do you think will take it's place? Or maybe no single altcoin can replace ethereum?
First, this is an imaginary scenario far from reality because if ethereum disappears tomorrow, all the projects developed in top of ethereum will disappear as well. Binance smart chain and arbitrium and a lot of networks and crypto-bridges will vanish overnight. I invite you to imagine all the consequences caused by your hypothesis and if you can tell what you find.
Second, as mentioned in previous replies, do you think people will keep trust other altcoins if Ethereum vanishes overnight? You are talking about the second largest market cap in the crypto industry, and the first network to build smart-contracts in the blockchain. I can say that even bitcoin as the first store of value standard will be infected by such an event.