I think the weakness of this approach is the difficulty in coordinating decisive, unified action. Perhaps that's inherently why the Libertarian party has trouble gaining traction- when an autonomous individual is the highest authority, nothing collective gets done, because getting everyone on the same page is like herding cats. I'm not a fan of the Marxist Hive-Mind, but admittedly it can bring raw power to bear on fixed points. In theory, a totally decentralized party would work awesome- if every indivdual was equally proactive, intelligent, and motivated. But I'm not sure how that would play out in practice.