The biggest problem I see for another controller is cost. Let's say the controllers cost $40. The camera cost $40. I just don't see many people shelling out $120 for a single player, two controller setup. And if not that many people have it. what incentive is there for developers to implement it.
Anyone can guess. It takes no effort to throw out lots of predictions and have some of them be correct. You are not and wiser or better for having your guesses be right. Even a blind man can hit the bullseye.







