Using a blockchain has little benefits. And I believe it's energy cost is really not worth it in the current situation.
This is a perfect usecase for blockchain, because we need permissionless writes to a distributed ledger. The energy costs of running the blockchain would likely be equivalent if not less than the current system (what's the energy cost associated with running Godaddy?).
An alternative would be to scrap the idea of memorable domain names all together, and move toward something like QRcodes + tor like public keys + petnames or similar.
I almost feel the need to challenge that these days. While it's absolutely true as far as the original intention went, and is true to a limited amount today, I think the days of most people typing domain names into the location field of their browser is largely over. Google search is the modern DNS when we're talking about that purpose. Today, I think DNS is much more about the permanence of an address, not whether it's memorable.
DNS is identity.
Almost every source of internet identity is either in DNS or is, at root, based on DNS. The only exceptions I can think of are PGP keys and blockchain, and they struggle with workable trust mechanisms.
You could say registrars and CAs underpin DNS, but they primarily exist to support DNS.
This did begin to change before the rise of phone number storage tech, but it doubtlessly spurred the adoption of that tech.
Can't all ipv4 addresses be represented this way, since it's equivalent to a 32 bit int?
Nothing will happen unless it's integrated into the major browsers. Afaik, no one is planning that.
My major concern would then be what about Aurora (1ExFLOPs), Frontier (1.5ExFLOPs), and similar computers? If the big draw is to avoid censorship this seems like a big concern. Potentially making us all more vulnerable because someone like China, Russia, or America could decide that they want to spend all those computing resources on an attack. It's not like these machines are a significant portion of the national budget and are really dwarfed by military budgets. We're only talking a few hundred million dollars to build and tens to operate.
I like the idea in principle, but is this worked out?
> Old and busted: DNS over HTTPS. New hotness: DNS over blockchain https://twitter.com/dobes/status/1164412915648086016
Original quote from https://blog.fefe.de/?ts=a3a04f1b
Here's the IPFS  and Outline  copy after bypassing the paywall