We know this. The Wii is no longer (it really never was) thought of as a "hardcore" video game system. If your an avid gamer, you probably own a Wii for the fun and social factor in addition to owning a PS3 or Xbox 360.
Third party publishers will not find a river of success by making games for the Wii. Instead, they will continue to make games for the Xbox 360 and PS3.
Personally, I own a Wii and a PS3 and can tell you that the vast majority of quality titles that will come out for the Wii in 2008 will be created by Nintendo. For PS3, you will see many cross-platform games as well as exclusives from third parties.
Honestly, I may not buy another game for the Wii after Super Smash Bros Brawl. But, on the PS3 I can look forward to titles such as Killzone 2, GTA IV, Burnout Paradise, Metal Gear Solid, Haze, and Resident Evil 5.
