Personally if I was going to carry around a 7" tablet device, I would just carry a real tablet that can do so much more.
*I would just carry a real tablet that can do differently stuff.
Since when people use tablet to play AAA games? NVIDIA Shield's failure is a good example about how the AAA games are yet to enter the tablet market. This is a bold move from Nintendo to succeed where all other have failed. They look at the number of tablet on the marked and are thinking about how much money they'll make if this market were massively buying their 60$ AAA games.
In my mind, it's their last attend to lead that hardware market. If they fail again, the 'switch' (get it?) to iPad/Android is going to be a lot more simpler than WiiU.