I really don't know what Nintendo will do next.
I expect them to either
A) Go hybrid
YEAH!
B) Go back to the just motion controls and try to start a new with a more sophisticated motion control system. I think the tablet controller was a mistake. I think Nintendo believes that too.
BOOOOOOO!!!!
Seriously though it's not the tablet, it's the concept of having outdated hardware with a gimmick controller. That concept was a big fad with casuals and then they all went to smartphones and the traditional videogame market, the only one that will actually buy a dedicated videogame machine anymore, doesn't like it. The Wii U isn't bombing because the tablet just ain't that hot but rather because the whole basic approach that the Wii had is no longer marketable. If Nintendo sticks with gimmick controllers as their console design it will fail.
Besides the whole thing is forced anyway. It's like they come up with these controllers to justify the console being a seperate platform from the handheld. If the only reason to have a Nintendo console is to use some wacky controller that only works well for a handful of games and is an annoying chore to use in everything else then why buy one? Nintendo doesn't seem to want to work with modern hardware and they can get away with that on a handheld. The market doesn't want a console that's a generation behind if the only justification for its existence is a goofy controller. The hybrid lets Nintendo work on the sort of hardware they want to while also providing a product people actually want.
I'm happy Nintendo at least somewhat acknowledges the idea. Maybe Miyamoto was given a question directly about a hybrid but at least his response wasn't "A hybrid? Why would we do that?" He wasn't caught off guard like Nintendo was when someone suggested using two Gamepads at the same time.