I'd say the very simple solution is to have representatives decide. Then there's a separate debate about how to the representatives are assigned. At random, based on voting, based on competitive self-appointment by means of heavy weaponry, etc.

Blockchain may or may not make it easier to bypass the concept of having representatives decide, but this assumes we'd want to in the first place, which I am in full agreement with you: this is a feature, not a bug, so I don't wanna, so I don't need blockchain.