Well for Wii I think Zelda Skyword Sword and Metroid Prime 3
I think if Zelda's Skyword Sword is a good game and its motion control gameplay is innovative and used sensibly it will be remembered as another classic Zelda game that set standards for an action adventure that uses motion control.
I also think Metroid Prime 3 might be a classic because of its lock on control scheme. I can't see a dual controller stick controller without motion control or a keyboard mouse button control scheme replicating it as well and comfortably.
I'm not sure if Wii Sports will be a classic. It didn't impacted me as much as it did for the "casual" gamers and I can't see them playing it 20 years in the future similar to how I don't think people in their twenties or thirties think highly of Pong as they did when they first played it. Nor do I think they will feel the need to bust it out of their attic or basement to play it for fun but maybe for nostalgia yet even then I think they will do so as an afterthought. Wii Sports will be remembered as a significant game that help the Wii and motion control's success for at least the 7th generation, though.
It's quite funny how Pong and Wii Sports are so similar though.
Edit: Misinterpreted the thread's question.
