The Wii U GamePad is a part of the entire console's UI. Unless Nintendo decides to rewrite it, I don't see that changing.
Comparing this situation to the 2DS & 3DS is silly because the 3D was never central to using the 3DS in the first place, it was always an "extra" feature to use when you wanted. Nintendo pushes for asymmetric gameplay with the Wii U, and I don't see them foolishly splitting their userbase unless they are extremely desperate to reduce costs.







