Yes, ADA is a potential coin but it is not easy to replace ETH, at least ADA should be able to drop the BNB position so that it has a chance to beat ETH. But that won't be possible though in the future.
Both will not be possible in the near future or in the future, because BNB which is very close to ETH alone has not been able to beat ETH, moreover ADA is still very far from ETH level, as well as defeating BNB, ADA coins still need a breakthrough new so that it can drop BNB, because BNB is now very strong with its BSC support.