Well eventually it'll have to just not as fast paced as it did in Japan. Wii is sitting pretty dominant right now especially in America. And DS is doing so well in Europe that Wii will just float along right with it. I mean it would take a lot to take it down.
There's not much the other consoles could really do to affect it either. Only one scenario I think presents a potential issue to Wii in the future that could be caused by a console. That's if Sony releases GT5 along with a price drop for the PS3. I think that could really affect it with such a big game and a price drop. Of course that's still only one event and what about long run.
Right now it's looking pretty good for the Wii in the west and I think Wii will return to somewhat of it's dominance in the east eventually. But as long as Wii Fit is still this hot with good 3rd party support and other big Ninty games, Wii should be fine.
