See the book in this post: http://www.freerepublic.com/focus/f-news/2489017/posts .
It outlines a strategy similar to what you are endorsing. Not mega centralized groups, but many smaller groups. It uses ideas from free market economics create the system (think Smith’s inivisible hand applied to politics).
I heard another example of this where someone said they could beat any of the greatest football teams in history if he were allowed to field as many players as he wanted. It didn’t matter how good the other team was or how good his own players were if every square inch of the field was covered with one of his players.