I remember one night I went after Halloween and a security guard said it was maybe 4K people that night. And that night had no lines all night.
I think realistically, that's how low it'll have to be, given how all the new measures will take extra time.
As to how Universal will recoup money from such low attendance, best bet would be maybe to close the most costly rides, charge a little extra (that is if we're getting the same amount of mazes), increase alcohol prices, absolutely no tram usage, way MORE nights -- maybe almost every night OR way more weekends from first week Sept to mid-Nov, extended hours -- imagine if they could get two ticket groups worth of people in the same day if they cycle people in and out in just a few hours which is unlikely but could work under the best operational circumstances (5 PM - 9 PM; 10 PM - 2 AM) , and then last but not least and the most likely result of all this, reservation only with absolutely no "just showing up to buy tickets,"