I think it was just brainstorming based on Eliezer's post; he also wrote about the sanity water line, which I see your rational society approach fitting in with. Maybe a dojo is a bit extreme, but I think a zendo isn't implausible, with people working on rationality koans. Or maybe rationality group therapy, where people can express potential irrationality that they can receive non-judgemental feedback on. Grassroots bottom up approaches could work with larger top down approaches to create the rational society, or whatever word Yvain might find less taboo :)