Look for a much larger crowd than what you are saying.
NO WAY. The weather and the fact that nobody really cares about the race might keep it below 7500. Last weekend they got 2500, I wouldn't expect anything more than 10K. Nobody cares about Big Brown running against a bunch of grade 2 grass horses.
Now if he showed up for the JCGC, Belmont probably would get 25K for the Curlin-BB matchup.