So far, I'm planning on going, since I was planning to possibly run the Food & Wine Half Marathon.... if they have a runDisney event. I think that's still a pretty big IF. In the fall it's highly likely that I'll still be worried about transmission, so I don't envision upgrading to the VIP. I had asked whether the food stations would be located indoors only, or have access to outdoor space. It could change with the new dates, I suppose, but at the original booking the response was that the VIP refreshment area was entirely indoors.
It'll be super hot, and of course, hurricane season. Although having the event any later it would run into the 50th and then into the holiday season. After a while, if it would have to be postponed again, it would be better to have it spring 2022 than try to compete with the 50th and 2021 holiday season.
On the other hand, Sept means there will be Halloween parties, and if not outright parties, then perhaps costumed attire in MK. So DIS Reunion cosplay could be "a thing" for that time of year that we couldn't get in the Spring.