As Apple and Sony claim to be capable of offering screen-controllers, as the wii-U controller seems to be too expensive for now to make people buy an extra one during the first year of the console's release, I propose Nintendo make a partnership with Google to propose a device, a controller with joysticks and buttons where u can insert your android smartphone to do the screen/accelerometer functions. With a Nintendo app in your phone to connect to the wii U.

Now I don't know if it's possible if we consider the different hardwares of the phones for compatibility, the wireless data transmission between the devices (that even big N seems to have issues with!), the fact that Sony-ericsson androids phones would probably be banned of this project! The fact that Google, Samsung, Htc may have their own interests and projects in the videogame business...

But, if there was a chance of realizing this idea, I think it would make a sufficient buzz (sharing pics or docs by sliding them from your phone to your tv, fun  local-multiplayer experiences of course...) to sell the console, even reassure idiot investors who wanted a Mario on phones.