Just need some sort of standard developed so that people can rate each other in different ways & those ratings can be weighted in some sane & helpful fashion. Lots of social graph problems to be solved in decentralized systems.
Discussion
Which is why small communities are far more likely to accomplish and maintain a system that will work.
Any larger system will fail in the face of human nature.
Nah, I think, like Bitcoin & the internet in general we will see certain standards emerge that will spread & scale to facilitate the development of robust global trade networks