If we remove tokens and bridges, I think that Ethereum's uses for deposits are more limited than Bitcoin's, and therefore if the fees for those transactions are low, Ethereum will attract all the liquidity that was going to Solana and other altcoins, and if they are high, the investments will go to those altcoins.
that would completely defeat the sole advantage that ETH is having compared to bitcoin though.
I think the main reason ETH could get this far because the easiness of deploying token, no need to create our own blockchain just use the ERC20 protocol and a project already have a token that pretty much has the same capability as coin.
moreover the smart contracts also proven to be a game changer, but it also comes at cost, since ETH is among the first one to implement smart contract capability anyway, it's inevitable that the deisgn might not be perfect, at least not as perfect as the more recent blockchains e.g solana, bnb and so on therefore the never ending problem of the gas fee.
even it seems ETH just want to offload transactions completely to L2 to mitigate the gas problem and instead focused on creating quality L2 that up to standards.