I have predicted Avatar will be the number one worldwide box office movie. Somewhat risky prediction. Counting on more “legs” in the foreign markets. Move up from the current 67% foreign to 72% or so. Avatar needs $550+ million domestic and $1.3+ billion foreign.
I am thinking $580 million domestic (with some Oscar boost later this year and not counting likely re-releases). An exceptionally strong and long Imax run could help push it to $650-700 million domestic. Foreign box office of $1.45-1.6 billion is my current guess. Thus about 20% chance of first $2 billion movie and 70% chance of beating Titanic for number one.