though, I think ETH still leads any other L1 smart contract and dapps, although their is BSC highly touted as a big risk and competition for ETH, so far it's ETH that's in the first place. The only reason that the projects did stay away from ETH network is the network fee, but since it moved to PoS, then perhaps this issues have been alleviated already.
But as a developer, it's good to have this kind of alternatives so that they can rightly choose which one fits their needs.
So it's a win win for them and for us crypto enthusiast.
I agree that those two are the only ones, ETH is the greatest layer one there could ever be, it's just too good to give up and it's definitely decentralized and now has staking and it also provides smart contract to many tokens at the same time. The chances of something passing ETH on all of those at the same time is slim to none.
BSC is doing very well, and maybe USDT will pass it but it's not going to be profitable, so BNB will keep on being third behind ETH, there is a chance Matic could be liked more than it is liked now, but not more than BNB nor would be used more than BSC at any moment soon. Something huge has to change for both of them to make that switch.