That situation would completely lock out any new innovators from entering the market, since they would need (a) enough money up-front and (b) the explicit permi

That situation would completely lock out any new innovators from entering the market, since they would need (a) enough money up-front and (b) the explicit permission of most if not all leading patent holders. The major companies would effectively be using unjustified patents as a form of collusion to erect insurmountable barriers to entry around the US mobile market.