This is all that matters
Passing Avatar's total WW will be a bonus
It honestly doesn't even make sense to compare Avatar and Avengers: Endgame tbh. Avatar and Iron Man came out within a year of each other, and they were both the first of their respective series. It's all the more amazing that Avatar mopped the floor with Iron Man because it was an untested property, when on the other hand multiple generations of people grew up with Iron Man. The end of Avatar phase 1 will be a $6 billion picture at a minumum. I don't even want to speculate how much Avatar: Endgame will make. Like it really boggles the mind that Cameron's warning shot blew the entire 20 movie MCU out of the water when you are thinking about it, which I am.