Not really, no. At least, not yet.
They're down slightly YoY, but the Wii is down more. And we haven't had an enormous number of high-quality games releasing early in the year.
The holiday season is packed with both exclusives and multiplats, and sales for both platforms will explode in Q4. So, it would be a good idea to cut prices just before then - in August or September. The Wii could well outsell them through the summer, but that will change with the onset of the holiday season, even without a price cut (and the lack of a price cut, especially for PS3, is pretty much impossible at this stage).