You people, with ridiculously high predictions, are crazy. The sequels will gross less than Avatar, even if they're better movies (to most people, since quality is subjective). Like the previous poster said, it is a ridiculously high mark to pass. Dunno what Terminator 2 or Aliens have anything to do with it. The former is a sequel to a movie that didn't even gross $40m and the latter a sequel to Alien, which did something like $80m. And before anyone accuses me of anything, i'm not a hater, to the contrary, i'm a Cameron fanboy, love Avatar.If i had to put down a number, i'd say $500m DOM / $1500m OS. Those are still huge numbers, wouldn't surprise me if it would do even a bit less.