If you take ST09 domestic + ID foreign, you're already basically looking at $500m, and that's before adjusted.
I think both can easily be matched.
That's possible but it's more likely that domestic will fall short of ST09 but international will increase to make up any shortfall. The best case scenario is that STB matches or even exceeds STID (I don't think it will match the nostalgia effect of ST09) and the international increase pushes the WW cum closer towards $600m. The biggest obstacle is that international ticket sales have to increase a lot more because currency rates today are much weaker than back when STID was released. It will have to increase sales just to match STID and need an even greater bump in tickets to expand the overseas revenue.
Based on initial reactions, it seems exactly the type of movie that the Chinese like so I'm fairly confident we will see some kind of increase there. I think China will be good for another $30-60m (depending on the release date) and the rest of Asia should be good for another $12-20m. I definitely think it can expand its numbers in places like Hong Kong, South Korea, the Philippines, Thailand, etc. I also think it can increase a similar amount in South America. Mexico, and Brazil are big markets that do very good box office for comic book hero films so a lighthearted and action packed scifi romp should increase somewhat now that it is more of a known entity. The country I am watching as an indicator is Australia, an English speaking country without the long history of the franchise we have here yet also having a strong asian influence. They seem to be a fairly good indicator of general acceptance. If it breaks out big there I think it bodes well for the rest of Asia and the UK.