Has futarchy actually shown evidence of working? My understanding of Hanson's research is that his studies were largely conducted on groups of econ students. Correct me if I'm wrong.

If we restrict "governance" to the goal of making it easier to create secure smart contracts (as playerdeus suggested), I don't think the decision-making process needs to be so complicated. I much prefer a simple time-tested system, such as having representatives with separated domains of expertise. Complex decision-making systems will lead to attempts to game the system.

As far as monetary policy and multiple governments, I'm just putting out ideas, so feel free to ignore them. Maybe each government/organization would issue their own currency, such as DAO tokens or Augur tokens. Then it's up to their individual organizers to determine monetary policy. ETC would just be a commodity that reflects different exchange rates in different token-currencies.