Kind of negates the whole mobile aspect of the mobile phone.
Is that a phone in your pocket, or are you just happy to see me?
This is just another example of how there is no imagination in mobile gaming. Let's combine an Xbox 360 controller and a mobile phone. Real creative.
These kind of perifrials will never catch on. They need to rethink how to have controls without the use of thumbs, since the screen occupies the same space as thumb controls would go.
What about an analog pad on the back of the phone controlled with the left index finger and buttons on the right controlled by the right hand fingers? This could be built into the phone, or even accomplish with a case.
If testing shows you need thumb controls, fine. Make a controller that is the same width as a phone in landscape,make it about an inch tall, and have it attach to the bottom. Just keep it flat. Gameboys didn't need joysticks. Use analog pads.