As a Wii U owner, these sales are deserved. I love a lot of Nintendo franchises. The Wii U will eventually be worth it for me. But for others? There's very little appealing about it.
You can even look at my own situation. I love platformers, and Mario is among my favorite franchises. I didn't even buy NSMBU and I own the system. I just bought NSMB2 months ago, and it completely underwhelmed.
So while I wait for Pikmin 3, my big selling point was playing Black Ops 2 with pointer aiming. While I love pointer aiming and hate dual analog, I can readily admit that most players are not on the same page as I am. They're more than happy playing Call of Duty a week earlier, with all the DLC, with their friends, on the other platforms.
I guessed before the console released that due to a lack of innovative dual screen games on DS/3DS, that Nintendo had run out of ideas for a two-screen set-up. And from what they're showing, they've done nothing gameplay-wise to prove the necessity of this new controller. Miiverse is great with the controller, but nobody is going to buy a console because of Miiverse.