Thus far we get regular reports (See the NA sales thread) of 80GB consoles out in the wild, and yet PS3 sales are still tiny given we are 2/3 weeks from the biggest PS3 exclusive that will exist until the end of next year.
Microsoft on the other hand has a number of high-profile appealing (to Western gamers) exclusives due at the end of the year. We all know sales and profile wise Gears 2 will stomp on Resistance 2 (regardless of quality), Fable 2 is the sequel to a last-gen game that sold about 3 million and every hands-on in existence has been positive.
As for the whole BK3 vs LBP thing? They have as good a shot at promoting sales as eachother.
To answer the OP. Sony will only respond if they can still create the illusion they'll eventually turn a PS3 profit for investors.
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