BSC is already better than ETH or a ETH killer right now ethereum price should still remain at 1000+ price tag, either with high gas or not ETH is still a big BOSS. 
The understanding is this, Ethereum will still be big forever because it has a smart contract earlier so that it can be used by others including BNB before BNB has its own smart contract, namely BSC, so in general ETH will still be good even though the transaction fee is very expensive, and BSC will also not be bad as an alternative alternative to save transaction costs.