These numbers are off. Disneyland park capacity is closer to 54K depending on if everything / all walkways are open. California Adventure has a capacity in the neighborhood of 34K, with everything open, less right now with Bugsland closed. In the past, there have been "attendance" numbers given for Disneyland of 80K on NYE and such, but that is the number of new admits, not the number of people IN the park at one time.
If you look at the size of SW:GE on a map, and the size of DL, you can estimate the area will be about 10-15% of the current park. I would not think the area can handle more than 7-8000 people at a time.