I do see alot of people saying Polkadot will replace Ethereum in the long run, but I don't think that's ever going to happen, cause Ethereum is the king of altcoins, I know Polkadot has some crazy features but still that doesn't mean it's going to take Ethereum's place in the crypto ranking, Ethereum will always be the best altcoin out there, no doubts, have always believed in it.