Goerge Barna my have just done something really big for emergent churches by releasing his new book Revolution. To me Barna represents an epitome of the modern era: numbers, facts, quanity. So when someone like that says things are changing/need to change. To me that will help validate this type of discussion in the eyes of those who are specpitcle about the cutural and need for missional shift in ministry. He has some great things to say on his site also.