I've also dreamt about a system like you describe for quite some time. The benefits to mankind could be enormous. The range from humanitarian and social problems that could be solved in an agreeable manner is quite astounding. I am very curious how this will work out in a used network, specifically if the rules set in a smart constitution could be valid and apply to resources outside of the defined system (tau/the application running on tau). I am also very interested on how a user-interface for up-scaling discussion might look, and how it would keep peers w/l little time or knowledge on subject engaged.
The beauty of it is, that these decisions could also be made using up the inherent logic of the system. Your post made me a bit more excited about the future again, thank you!