In regards to capacity, I believe max capacity is 100K. I believe average attendance is around 65,000.
Like Ryno said on a recent show, if you've been there on an average day, and thought it was pretty crowded....50% capacity isn't much better than that.
I do think/hope their percentages will be based on average capacity and not max capacity.
Yeah, I don't think people realize just how crowded 50% capacity is. That is what most of us would consider a pretty crowded day in any given park. 100% capacity means the maximum number of people (pre-COVID) they could allow in the space of a park without it becoming dangerous for people because of how crowded it is. Imagine Oga's Cantina in SWGE, but throughout the entire park (maybe not quite that bad, but close). That's what 100% capacity is. There's no way Disney is going to open any park at more than 20% capacity, at least until they can see how American visitors handle their social distancing measures.