Easy & reliable p2p would upset so many apple carts. I get the feeling that if something really started taking root in that space, the big boys would push for a new obstruction--i.e. NATv6 or some such thing--to put the genie back in the bottle. And since so many people "fake it 'til they make it", they will swallow those worms like eager baby birds. Anyone who rejects the worms will be branded a heretic.