Considering that Sony and Microsoft finally learned that it was worthwhile to neutralize Nintendo by selling a similar gimmick as an add-on, they're probably both already designing superior tablet-pads that could be out by the time the Wii U launches. Imagine how cheap the PS3 and 360 motion bundles will be by then? They could both have tablet-pad bundles on shelves the day the Wii U launches, only at a lower price.
Your on crack if you think this has at all neutralized Nintendo's otherwise cornering of the motion sensored video game market. Does anyone actually own a Sony Move or Microsoft Kinnect? I would guess probably better chances of people owning the kinnect as its outselling the Move thing 5 to 1.
I'm not saying that either the Kinect or Move are outselling Wii consoles, but the Wii offers nothing that the other consoles don't do better now and it lacks proper online play, which is critical today. The Wii's sales have been plummeting for a while now, but I think that it likely has more more to do with the novelty of motion controls wearing off than people flocking to the competition's motion control alternatives.
At least when the Wii launched, it had a single unique gimmick to justify it's existence. The Wii U is another last-gen-as-next-gen product, but it's only distinguishing feature is now a clunky stripped down version of what everyone packs around in their pocket. I think that the Wii U would have gone over much better if Nintendo had it's own version of Xbox Live up and running to show off for both the Wii U and 3DS, which appeared to offer even more, only for free.
If Nintendo is going to offer less than the competition when it comes to hardware, then they need to justify their platform with software. They should've waited until they had a PS3/360 quality new Mario game to show off with the new hardware, instead of footage of Wii, PS3 and 360 games.