I have no problem with any of you guys/gals guessing low, its the trolls that come in and do it that bothers me...
$1. MOS will make $1, worldwide.
Really though, no clue how to even begin to estimate the numbers. I'd expect something stronger than BB, given that WOM has been really good for the film so far from the previews, and the entire global audience has been blitzed with superhero films over the last decade (so they're aware of them and not terribly dismissive, as maybe they were at the beginning). That said, I'd expect numbers at least
similar to BB's numbers, since the movies are similar in principle and both released by WB.
So, conservatively, I'll say it makes 10% more than BB, and adjusting for inflation since 2005, that comes out to:
$478 million, worldwide
With better WOM than BB, though, I think we could see a 10-30% boost in the previous estimate, and the film could make up to
$622 million, worldwide
That said, I haven't even
considered the effect of TDK trilogy's success and Nolan's involvement in the film. That could be the wildcard that shoots the movie past $700 million, given that the film receives good reviews.
Hold me to it.

t: I know, I know -- quite the range -- but I think some of the variables aren't easily appraised.