Could only be interesting to have a small touch screen add up to the controller. So instead of have a "button 1", "button 2", "button " and so on. just some icons that could change from each game to make easier to find the menu or action.
But there are some draw back. as noted you must look on the controller during play to find the button/icon also i don't know how to manage the fact that while holding and waving the controller you are likely to touch the screen. Maybe not a touch screen but LCD icon on buttons could give this contextual feel.
To finish, if i remember well sony have made a patent for a controller of which the button partern are touch screen. So they can have a pad that could replicate/emulate all pads. don't know if Nintendo want to do it also, how they can implement it without infringe the patent.
But we must first concentrate ourselves on the way to entertain people, for video games to live. Else, it's a world where sales representative will win, which has as effect to kill creativity. I want to say to the creators all around the world:"Courage, Dare!". Shigeru Miyamoto.
