What I think is far more likely is that Nintendo will design a new, more advanced motion controller for the Wii U, and the next Zelda will support that. With Nintendo's love this generation of creating peripherals that are created for 1 or 2 specific games and then rarely supported otherwise, it would fit their pattern to do that again with the next Zelda. Nintendo loves any excuse to throw out new hardware accessories they can use in marketing.
I don't see the Wiimote+ being used for any game Nintendo makes that they really want to use to show off the Wii U, especially as the years go on and the Wiimote+ looks increasingly antiquated in motion control technology. The less advanced games like the next incarnation of the Wii series would probably still support it, but for the most part I think it'll just be supported for BC on Wii titles.