I don't think it's MAP that's the real hangup. I think most of the retailers don't think they have to take a hit as long as no one else is doing it.
The 5d3 and 1dx are great (new) products that will continue to generate orders . . . my experience is that vendors are more concerned about losing orders to other retailers. Amazon and Newegg were going at it (watching each other, bestbuy and walmart) last year, but this year the deals have been pretty much ho-hum across the board.
I think that every time we declare a sale DAY, they pull back because of guaranteed orders . . . this year Cyber Monday was the new buzzword on everyone's lips that wasn't one of us doing 99% of our holiday shopping online.
We may still see some price drops, but it's a moving target.
(I changed sales to orders where appropriate to avoid confusion)