I agree, Cardano is pretty darn cool. However, I don't think ETH is gonna sit idly by and let Cardano take center stage. Too many coins, ICOs, and DApps rely on ETH to allow it to fail. Just my opinion, and it's worth all that you paid for it.
Exactly. Too many "good" dApps currently rely on Ethereum, and this is the only reason why
it's not gonna be easy to beat Ethereum in terms of popularity and market-cap.
Current major issue of Ethereum:
https://www.coindesk.com/vitalik-ethereum-app-builders-screwed-scaling-limits/