I don't see any reason to believe they won't both stay relevant. Even if gas fees were equal, BSC has brought enough attention and money over for it to remain competetive. By the time ETH gas is cheap, a lot of the incentives to move back to ether will be available on BSC anyways (multi-chain project expansion).

Sorry, I didn't realize new users weren't allowed to get excited when they see a token they've been following. Is quoting frowned upon here?

Small dip. Good entry for this masterpiece!