I don't know if anyone has seen the article re: Tyler Perry Studios and how he intends to run Camp Quarantine as his studios when production picks up with casts and crews. I imagine the scenario will be analogous to that of the NBA at WDW. Generally speaking, it involves getting tested and quarantining at home for a period of 2 weeks, then getting flown privately to Atlanta, then being transported to a hotel where you're tested and quarantined again. Then there's then a lot of transporting back and forth to sets, etc, possibly more testing, and ultimately not breaking the bubble once it is formed.
If the NBA does show up to Disney, I imagine that they'll have strict policies and procedures for players, staff, and crew to not break their bubble. Allowing them to go the parks may be too risky. Even if the parks are cleaned, there may still be risk involved. Are the cast members who operate the rides and shops being quarantined in their own bubbles?? Or are they allowed to go to their houses, and be out in the real world on their days off, etc?
So in the speculation game that we all play - I could see either NBA just being locked down to their resort and the MK being open to public. Or all of Disney being solely for NBA use, and closed to public - but this is the more unlikely scenario, in my opinion.