legal, the king of alcoins is ethereum in this forum no one disagrees if ethereum is the king of alcoins, this proves ethereum is a big coin and in the future ethereum coin cannot be competed with other alcoins, if btc is destroyed can ethereum replace btc ?
When Ethereum was made the king of altcoins in many opinions. Not that Ethereum can replace everything. Destroying Bitcoin is tantamount to destroying the crypto market. So it's not right if you ask "if btc is destroyed can ethereum replace btc ?". You have to ask, what would happen to Ethereum if Bitcoin didn't exist? Maybe Ethereum doesn't exist either? This is not the right time to talk about BTC crashing or anything, because investors are investing in Bitcoin in droves. If you still ask questions like that, it seems you wrote something without thinking about the facts.
They will grow together, but I doubt ETH will ever flip BTC. Bitcoin is the king and started it all. BTC is the original cryptocurrency, the most decentralized, with an organic and anonymous creation. None of that will be replicated again, therefore it is special. Ethereum is a completely different use case and they will both grow together.