it's not simply putting a screen on a controller, dammit, it's so much more than that
Like? :o
When gaming nobody will actually want it there for anything more then a health bar display or inventory system or something. And even then I would find that incredibly annoying having to look at a different screen for stuff. :/
Not to mention the controller itself looks like the complete opposite of ergonomic. I wouldn't take anyone seriously while they were using it.
The motion controller aspect to it will also go untouched. The PS3 already has that built into its controllers and it is hardly used for anything because it's non-intuitive. It was a gimmick.