I think the idea behind the Wii-U was a full-circle for Nintendo.
1) DS came out with touchscreen controls and made gaming open to non-gamers
2) Touchscreen smartphones (iPhone, Android) got touch-only games like Angry Birds and Temple Run
3) Modern Tablet computers evolved from Smartphones
4) Wii-U tethered a tablet to a low end game system
Honestly I think Nintendo stuck the word "Wii" onto the title of the system simply to cash in on its best selling home console ever. It didn't work.








