Force Awakens has been safe for a while, and Avatar seemed to be a given but it will probably be a little closer than previously thought. It should still clear it though. The real question is if it will catch Avatar to become #1 world wide. It should be close. But even if it passes, Avatar could do a 10 year anniversary re-release ahead of the new movies and take it right back.
I follow a box office group on reddit and they are able to make projections based on a movies legs with incredible accuracy. 850 million looks like the domestic with the WW coming extremely close.