If Busch Gardens has to put caps on the number of attendees to get the park open and maintain social distancing you may see ticket price increase to bludgeon demand a bit and ensure there's enough revenue coming to cover higher operating costs per visitor. Alternatively you could see timed tickets (e.g. 2 or 3 block times each day) or some other limitation method to keep attendance down.
I could see a time period of memberships/passes purchased pre-COVID-19 are the only ones allowed in the park.