Personally I expect that at some point BSC will lose its leadership as the best EVM blockchain and if you look at
https://defillama.com/chains you can see how BSC has only been losing TVL since March.
Also don't forget that the network has recently worked poorly and it's far from the fact that this wont happen again.
I agree with your point. In fact, BNB as well as Solana are experiencing major network congestion problems, they have traded off most block confirmations for the nature of security to increase performance. I think that BNB might not be able to keep the top 3 in the market if a bigger boom and L2 roles are becoming more and more important like Avax or Polygon. Any compatibility has to be implemented, which is a higher level of competition for user preferences and needs. 2022, could be the big game in Web3...