Sure, but it is an US only thing. Even IW last year only managed to get a 41% drop weekend. Not counting weekday drops and OS drops, don't think it's happening.
Edit: There's no weekend for China starting from next week either so even lower.
With your math, it needs 45% drops every week to get to 2.760b+ after week 8, which still very possible and squeeze pass Avatar a few week later. If this weekend drop is sub 50% then I can see it happening. Nothing is done deal yet.