It's great to see this kind of innovation in controller development and I'm very excited to see the way in which these controllers evolve. Having said that, I think touchscreen based controllers are bound to bring disappointment. Most serious games require the player to maintain a fine balance on the controls and tactile feedback is a huge feedback factor to the gamer. Touchscreen based controllers cannot provide this tactile feedback.

Another factor is that when I hold a button and stick controller, I dont have to look at the joystick, I can give my full attention to the game. Again with touchscreen based controllers I have to keep looking at the controller to make sure I'm pressing the right button, and the split second I spend look at the controller could get me killed. it will be interesting to see how these problems are worked around.