That...sounds awful.
If they're going 2 parks, Potter will be open. JK gets money for every person going into IoA. If that's the case, Potter will be open.
Plus, if they're going 2 parks, I think they have to grow the event and go more than 8 houses, and have MIB and Simpsons open as well.
I don't know if people are going to want to walk across the entirety of both parks within the time frame of the event, especially those who only visit once a year. I think keeping the west side of USF open is the way to go.