I am not a big analyst, so I can not predict the growth or fall of coins in this market. I do not exclude that in the future Ethereum will become obsolete as an investment tool, and it will be replaced by a more successful project, and I also do not exclude that this project will be Cardano. But all this will be possible in the future, and today, we can say with confidence that the Cardano project does not reach in many respects and is not a big competitor to Ethereum.
I don't think that this scenario is possible. Ethereum is a great project, with a lot of advantages and nobody will have the same level of usability.