You can try and save the interface for touch, but there is no way you are going to be able to play something like Mario Brothers on a touch screen with enjoyment. You think only 6 buttons, easy...but then you realize just how hard it is to replace a directional pad.
Besides, am I allowed to watch the game while I play it, or is Nintendo suing for that now? Nintendo's main audience has been children for ever. Once they started sending DCMA take downs to little kids recording their games to share, well fuck Nintendo. "Nintendo, we hate kids and free marketing. (Just let us die!)."
Sega offed before Nintendo, it's Yoko "Nintendo" Ono.