The beauty of bitcoin is that there's no need to "enforce" rules to others. There's no need to "vote" to decide which rules to enforce to all. Every node choses its own rules and decide to be in consensus with the group of nodes that has similar rules. So simple and so powerful. No voting.

That's great, but my question goes unanswered.

What happens when every person agree on something? They look for another thing they disagree on.