I see them going for this actually but games like Tearaway will still be unplayable since it requires the microphone and the camera.Hey Sony, here are some good ideas:
For motion controlled games - the DS3 or DS4 sixaxis could be used.
For the touch screen - a mouse cursor like the one in the nvidia shield could be used for touch controls.
For the rear touch pad - the DS4 trackpad could be used, and for the DS3, you could use the analog sticks while holding the R2/L2 buttons to simulate touching the rear pad. Since the Vita doesn't an R2/L2 this is possible and a good idea.