Likely as long as Nintendo can, more money doesn't hurt them.
Maybe, should sales start suffering, they could adjust the price, but if this should happen late in this gen's life, they could just ignore it exploiting the huge gap accumulated to keep first place.
This doesn't mean there won't be cuts, when it will be the moment, they'll be necessary to widen Wii's audience, but that Nintendo can do them following only its own plans almost without undergoing competitors' influence.