I doubt it will drop in price at all unless Apple thinks people aren't willing to pay that much of a premium for a retina display. Probably won't see a real price drop until the cMBPs are discontinued, in which case the rMBPs would probably go down in price to match the current cMBP pricing. I doubt that will happen for at least another generation or 2. I think a lot of people are still willing to pay the premium for the fancy display.