> (inability to just type in the URL) You could still put all domains of an alternate domain system behind a X.web3.org that loads the whole system client side

> (inability to just type in the URL) You could still put all domains of an alternate domain system behind a X.web3.org that loads the whole system client side, and then connects to peers via WebRTC to load the domain X via webtorrents or ipfs or zeronet or whatever. That way it's (mostly) backwards compatible to normal websites and you can remove the "root domain" trust point later.