The fact that the wand can be used much like the wiimote is exactly why it *will* succeed, I think. It will be cake to port Wii game concepts to the PS3, via the wand.
Not sure why people think that's a bad idea at all. The Wii and PS3 will start to have crossplat games, both casual and otherwise. That's a huge boon for both the Wii, the PS3, and the publishers making those games for the Wii today.