I heard a story about new ETH couple of times. Each few months we have 'new ETH", ADA for example was ment to be new ETH.
Yeah, there have been many projects that got called "Ethereum-killer" or "the next ETH". Still, ETH is enthroned above all the other projects right behind Bitcoin. I just think it doesn't need a "killer", we will rather see different blockchains that are interoperable between each other. Projects like Polkadot, Avalance etc. might not replace Ethereum but they definitely have the technology to be a top crypto!