For the most part, I'd say it's doubtful. All the big games are found on PS360, so I can't imagine that the draw of the Wii's exclusives would be nearly enough to pull over a significant number of the PS360's fanbase.
The Wii does have a decent appeal for drunken parties though, so that could factor in to a few of the PS360 audience picking one up.

It's all about the game.







