I see where you're coming from, but I don't think we have to worry yet.
Japan:
As other people have pointed out, Japan sees a slow period for all the consoles, that is one reason why we don't have to worry about that market imo. The other one is that there really are very few good games for the Japanese market out on the Wii at the moment. Different to the West, Zelda is no system seller in Japan and Super Paper Mario isn't either. Dragon Quest Swords seems to be a bad game and Mario Party as well as Wario Ware are good games, but not the ones a console buyer usually wants to get first.
In addition to that, no important games have been released in recent weeks.
Next week, Super Mario Strikers will come out. I expect that this game will boost Wii sales back to 50k. If it doesn't, it wouldn't be too bad yet because we still have Galaxy and Brawl that will boost sales massively. Anyways, as low as 30k is, it's still more than twice as much as the numbers of the first competitor.
America:
No real issue here. Selling almost 100k is absolutely great, even if the 360 is close behind. I expect the boost that the Wii will see because of Galaxy to be higher than the one that the 360 will see because of Halo 3, so the Wii will be able to shorten the gap until Christmas. If it'll ever be able to take the lead in NA will largely depend on the 360's trend in 08: if it is able to keep up above 60k, it'll win America, if not, the Wii will finally outsell it.
Europe:
People keep forgetting that Europe is the Wii's best market at the moment. It sell regularly over 90k while its competitors are struggling to break 40k. I don't see any of the other two consoles change something here. The casual market is far more important in Europe than the hardcore market, and the Wii serves it best. Games like Galaxy, Brawl or Kart will attract even more gamers and Wii Fit will keep the casual momentum alive.
Sony is usually strong in Europe, but its product is not interesting for european gamers because it heads into a completely different direction than the PS2 did. The 360 will become second in Europe I think, it fills the gaps that the Wii leaves open (action and racing games amongst others). However, it won't have a chance to close the gap to the Wii again because it has yet to build a brand name in Europe.







