iTunes channel for wii
So in terms of reality, I could see apple making an iTunes channel for the wii, that acted like the iTV. After all, I don't think that the iTV is as much of a profit generator as it is an enabler. It increases the value of iTunes media. Which maintains the strength of iPods, as well as increasing the consumer's refresh rate, in order to keep all the media and stream it. As such I don't think that apple it terribly concerned with selling lots and lots of iTVs without competition. And since the iTV caters towards really jazzed out home theaters, but the wii is more of a catch all, so the two wouldn't neccesarily compete that much.
As for thoughts that nintendo and apple should get together in a more substanitive way, while the companies do seem to have a lot in common, willing to be a niche player as long as it is profitable, having similar design athstetics, etc, I don't think the two are really compatible. Nintendo makes a point of releasing systems that are complete unto them selves and Apple wants to be a digital hub, but you only really need the digital hub for something that is incomplete, and i don't think that that is something nintendo really wants to do. And both companies tend to try to be the slpha dog in the pack, which means that any collaboration might end like the nintendo sony one that lead to the play station.