I agree with what you are saying, ETH is a big platform that will not be easily replaced, the switch to BSC is just an alternative, no one really throws it away, everyone is still waiting for ETH to solve the cost problem.
And now Ethereum has completely solved the problem of fees that used to be big, you can prove it yourself on the site I gave you right now https://etherscan.io/gastracker
https://etherscan.io/chart/tx
No more than 2M transaction per day
Compare with BSC
https://bscscan.com/chart/tx
up to 12M transaction perday