Welcome to my world, RolStoppable.
I wouldn't agree that the Wii is "just a fad" - 13m units sold isn't a fad. Nevertheless, I think that some people have presumptiously assumed that since the Wii is selling at a breakneck speed, it'll always sell at a breakneck speed.
Christmas 07 will be the teller of all things: will consumers really addopt alot of Wii software, like 06 (which it bounced upto a 4.0 attach rate on games like M:UA, CoD3, and Madden in the US), or will it follow the path of strong minigame sales?
Time will tell. Nevertheless, if the Wii does only move ~60k systems in Japan this week, it might not be the greatest, as the Japanese only view the Wii as a ultra-casual system, and wind up with DS attach rates (which are great for a handheld, but not for a console).
However, the big question is how it fares in the Western markets. PAL and the US are where it's at.
Back from the dead, I'm afraid.