This is interesting, though I'd point out that "consensus" actually means something different than a simple majority agreement. It means "broad agreement". Almost nobody would consider a 51/49 vote split among a large group as consensus; and even 3/2 in a committee of five would be a stretch, especially if the two in the minority are united on an opposing alternative proposal.

I'm not sure that invalidates the core of the post, though, since I think a different consensus criterion could be substituted without losing the substance of the game.