Maybe not a thousand; I stand corrected. But there are a lot of hangouts, and events at Disney World.
I mean, this is just one convention. 600 strong.
Star Wars is deeply rooted in North America; there is no doubt; it may very well set some new domestic records. I'd just like to set people's expectations. The world is a BIG place, and not everyone is accustomed to America's geekdom. I think anywhere between 1.5 to 2 billion is reasonable to assume (given the film is really good, of course!).
While costuming isn't the biggest indicator, I think Disney's desperate attempt to get China on board the Star Wars train is apparent enough. They dropped $800 million is Disneyland China last year (mostly Star Wars related), they released the original trilogy in theatres in China, new figurines and toys make an appearance first now in China (see the 16 foot Millennium Falcon, see their stunt on the Great Wall of China). I'm not knocking them; it's good business sense - but the reasoning is that China is an influencer, and that region simply doesn't give a damn about Star Wars. It can be said that it was Lucas's reign that didn't make the franchise reach the international market place as well. Disney is forcing it to happen. We'll see if their efforts have paid off.
3 Billion is farfetched. No way is it touching Avatar. At this point, unless there's another Wall Street crash within the next year, Justice League, Star Wars 10, Avengers 3, and Avatar 2 will be the next generation of heavy hitters. 2 Billion + club for sure.