I believe that ETH will reclaim it's glory back once gas fee issue is solved, there is also a big difference between BSC and ETH that will still make many prefers ETH, that's the fact that BSC is Centralized and ETH isn't.
for now bsc is the best even though bsc is decentralized but because of low transaction fees bsc is widely used by crypto users now. many users don't see the name factor of the platform but prefer one that provides low and fast transaction services. maybe if later eth transaction costs come back low then many users will come back to using ethereum.
BSC has come to light because of the high gas fees under eth network, which is a big burden for small traders. So right now, a lot of them don't care if BSC is centralized or not, as long as they are paying small fees. However, once ETH resolved their gas efficiency problem, a lot of them will go back again to this network. BSC has the advantage right now because it is also backed by the top 1 crypto-exchange in the market. So the trust is already there.