Ubisoft's Just Dance is doing pretty well on the Wii, Goldeneye will likely sell well, Epic Mickey is a great exclusive, NBA Jam is looking decent, and Rock Band/Guitar Hero do best on Wii. 3rd party support is far from dead on Wii, hell we even got the latest COD on the same day as the other systems
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The Wii has two advantages over the Kinetic and (especially) Move.
1. Numbers
2. Developer familiarity
Developers are not only figuring out what games to release on Wii, but how to make those games make better use of the 'waggle'. Hopefully we start seeing truly in-depth games (like Epic Mickey) that use waggle intuitively. In Twilight Princess the waggle parts were at first cool and novel then by the end of the game I wanted to plug in my GC controller, it didn't add anything to gameplay. I'm hoping Skyward Sword corrects that. And I think 3rd parties have gotten the message that they need to make Nintendo-like games (in terms of quality, fun/intriguing gameplay, and even nostalgia) in order to sell well on the Wii.
On a side note I think the Kinect is great because you can potentially do great things with it like let's say you're playing a fight game and your in a grapple mashing buttons to get out, and performing a natural reaction, like standing, gets you out of it. Then there's the fact that this is a test for Microsoft wanting to pioneer a Minority Report type of computer interface which could really cool.
The Move is waggle without a 30 million user base, and can be weakened by your lighting set up, I don't see it doing well, but I could be wrong.