I am a fan of Nintendo but they deserve the low sales of Wii U. What were they thinking believing a touchscreen on a controller would bring back the masses for the Wii successor? Nintendo should have been bold with another revolution by going AR Glasses gaming. This is the obvious (to me) next step in moving gaming forward.
Imagine wearing the AR glasses playing a Wii tennis game where the tennis ball coming towards you 'jumps' out of the screen onto the floor of your living room and hitting the ball more realistically with the Wii remote as it approaches you? Or imagine playing a Metroid prime game where the HUD is outside of the TV screen and head tracking for with minor head movements for more accurate and quick viewing? Or imagine a Wii Fit game where the whole room is a virtual gym and your virtual trainer is standing right in front of you and you can walk around your virtual trainer to get a better vantage point on a certain pose or exercise she is doing? Or a new Wii Boxing game where you actually dodge punches from a virtual boxer right in front of you with head movement and perhaps the AR Glasses are equipped with rumble for extra immersion so you "feel" getting "punched"?
Nintendo missed the boat by revolutionizing gaming again but played it safe and that's why the 100 million Wii owners won't come back for a second round. A touchscreen on a gamepad is not innovative, creative, fresh, nor exciting. Nintendo needs to really think outside of the box for their next console to get another stampede like at E3 2006 for the Wii. I wouldn't doubt they are considering AR glasses for their next console.
It would be something like this but with conjunction with the TV + Wii remote and nunchuck (SpaceGlasses) http://www.youtube.com/watch?v=b7I7JuQXttw and (CastAR Augmented Reality Glasses) https://www.youtube.com/watch?v=8c5qrOqiFt4 and https://www.youtube.com/watch?v=A1YvP7CtBKU
I think a while back Miyamoto said he wanted a video game to fill a whole room. This is something that can realize his vision. It could look something like this https://www.youtube.com/watch?v=kuF8wllPKcM The "prototype" is probably not real but something like that is feasible.
Too expensive? They could have just reused the Wii hardware to get it under $450. At least this hypothetical console would have sold more than Wii U.