I have to agree with almost everything and I really enjoyed this discussion and read. One thing though.
Not everyone, but some reasonable form of consensus such as 51% or 2/3rds+1
This type of governance makes sense for problem-solving but when it comes to moral values and obligations, I'm very sure we will need at least 90%+ consensus on for that one to ever pass. It's that last hurdle that worries me.
Attempts to enforce moral values often cause very severe immoral consequences. If we could get enough people to agree on some basics like the non-aggression principle, other things can be left as live and let live.