Short answer. No.
In this generation I don't think any console will have a greater then 50% marketshare as the systems offer greatly different gaming experiences. You may see those with a PS3 or 360 pick up a Wii as a party system or for kids, while when they really want to get to the hardcore games they have one of the two powerful consoles.
With GTA4 coming out on the 360 and PS3, expect the margin that the Wii is leading by to shrink even more. The GTA series has been very popular around the world and will continue to attract gamers to one of those two systems. Which one a person chooses will be dependent on what they prefer of the two consoles. But without that experience on the Wii, it will end up hurting them in the long term.
My pokemon brings all the nerds to the yard. And they're like, "You wanna trade cards?" Damn right, I wanna trade cards. I'll trade this, but not my charizard.
