I was looking at the title of this post and just pondering the whole situation. I know the intent of this post was for folks who had actually planned a trip over the actual closure dates (tbd) that are immediately affected. But now I'm looking at this post a whole new way because the fallout of this closure will affect EVERYONE who currently has plans or is only only thinking about going to WDW in the near future.
First off, when WDW does reopen - I have a feeling it will be a limited opening with just 1 or possibly 2 parks, and not all resorts and restaurants open. The staffing levels needed to reopen everything is just not there anymore. It would take a while to ramp up to a point where all 4 parks, reataurants and resorts, as well as places in Disney Springs, are open. However, unless there's a miracle, any place that reopens this year while we are still (1) waiting for a working vaccine and (2) have actually enough vaccine to inoculate everyone and (3) people have actually been vaccinated - I think there will be mandatory measures in place that somehow restrict access to rides and crowding in general. That means no parades and nighttime fireworks and standing in lines for rides - you would be required to have a FP+ to get on a ride. Current crowds levels in the parks would need to be handled, so the levels needed to cause the various stages of parks closures in the past could be drastically reduced. They could also totally restrict the parks to ONLY resort guests.
Now on the opposite end of such draconian measures, say none of the above happens. Anyone with current plans for WDW are still affected by the closures because there are many folks that are now planning to go to WDW during your trip that weren't before.