With the WiiU basically going that route of having a big screened controller, what are the chances that the Vita (or at least the guts of it) become the controller for the PS4. The latest estimates on parts cost for it are $159 and with the PS4 likely 18 months off, that will bring the price down further, possibly allowing them to launch at $399 with a Vita as the controller, making "take and go" gaming much more than just a side project for developers.
Obviously the traditional DualShock would work as well for most games.
Obviously the traditional DualShock would work as well for most games.