Not at all. The base model being $269.00 is cool but I don't see a $30 price cut making to significant and impact.
If Microsoft should counters with it's own price cut, it's a wrap. And I expect Nintendo to drop the price of Wii (maybe) and that would surely undercut it.
I see better sales for the PS3 for sure, but let's not get too ridiculous.
EDIT: So wait... is it true that this new slim model is actually a lesser value and even more expensive than the base PS3 model already available? If so, what a fail.