You guys are so delusional...
Wii isn't Gamecube. It gets boosts from non-traditional Nintendo fare and probably has the best support of any Nintendo console since the SNES.
Animal Crossing is at nearly 10m units on DS first of all. It did almost 3m even on GC. You should be expecting Animal Crossing Wii to do between those two figures on Wii. The other game, Wii Music can probably do 2-5m worldwide at least. Those two alone would be enough to keep Wii rolling along until Motion Plus games come out in Spring 2009.
The Wii attach rate for the average owner is 6.37 right now, excluding Wii Sports.
Do you really think from a group of traditional Nintendo fare (Mario, Zelda, Metroid, Paper Mario, Fire Emblem, Mario Kart, Smash Brothers, Mario Party 8, Mario Strikers, Mario Sluggers, Warioland, virtual console & all Gamecube games ), new-era Nintendo fare (Wii Sports, Warioware, Wii Music, Wii Fit, Wii Play, Animal Crossing, Big Brain Academy, Crossbow Training, and Wii Ware), traditional third party hits (Sonic, RE: UC, RE4, Lego Star Wars, Lego Indiana Jones, MySims, Madden, The Simpsons, De Blob, Tales, Nights, Red Steel, Call of Duty 3, Call of Duty 5 etc) and new-era third party hits (Rayman 1-3, Game Party, Carnival Games, Deca Sports, We Ski, DDR, Rockband, Guitar Hero III, GH: WT, Mario & Sonic, Cooking Mama, Boom Blox, Zack & Wiki, etc) that new Wii owners can't find say 5-8 games to play over the life of the system?
Thats what it would take for it to slow down - new demographics no longer finding 5-8 games they would want to play on the system.