I'd say the Christmas slump in downloads officially started Friday night, and boy are my numbers in freefall.
OK, I was expecting it, but it was still quite a drastic fall-off from the past Mon - Fri (Dec 14 - 18) which was my BWE. My downloads for this weekend (Dec 19 - 20) are about one third of what my weekends have been lately. I'm guessing that buyers were in a mad rush to complete projects this past week, buying a lot of images for things that had to be done by year's end. And from now till sometime in January sales will be in freefall.
Is this what you're experiencing / theorizing right now?
(I started at microstock in Nov 08, so I've been through a Christmas slump before, but I guess since my port was so small and all my uploads were pretty fresh, I didn't notice such a pronounced fall in downloads.)