The critical question is whether Ethereum can adapt fast enough to stay relevant. Do you think Ethereum will maintain dominance, or will new blockchains take the lead?
We do not know what can happen in the future, anything can happen. What I know is that ethereum is an altcoin and another coin might later take the second position. But right now, I do not think there is any coin that can be above ethereum but the future is not certain because we do not know.