Personally, I think it's an interesting patent, but if it hasn't happened by now, I'm not sure it's going to. Mobile developers have more or less gotten used to programming for touchscreens (even complex games like Baldur's Gate), and there are enough Bluetooth controllers, keyboards and mice to suit those who don't want to use their fingers.
Besides, if the sales figures for phone/tablet games versus 3DS/Vita games are any indication, consumers are not exactly dying for a return to traditional handhelds. We'll see what happens.