this. as nice as the animation looks. it's an impractical design. the problem with a system with no buttons and the freedom to stick virtual on-screen buttons where you want is that it removes the ability to learn a control pad. buttons are static...they never change. their use may do, but their position does not. it's the reason why when game X tells you the square button is punch, and different game Y tells you square button is pass the ball, you don't have to look at your controller trying to figure it out every time the game changes. you've learns where square is, it's second nature. a reflex motion.
this system of touch screen button that can be placed depending on the game, as many or few as needed sounds great on paper. but you can't learn controls in a general sense anymore. you have to learn them again and again with every game. the wii-u was like this with the few games that made heavy use of the controller screen. and personally i dislike it. a controller shouldn't be something you are constantly aware of, or a barrier into the world you're trying to be immersed in. it should just be a natural extension of yourself. and this, at least based on that animation, wouldn't allow that.