If it does or it doesn't get a price cut it won't matter to me since I already paid for mine.
I think they're planning a cut for this holiday season irrespective of MGS4 sales. They been on the market almost 3 years, with only a microscopic cut to show for it, and still have increased YoY sales. Combine a price cut with GeoW 2, and Fable 2 and the 360 is set for a massive holiday.