I'm presently booked for March 2021, but will cancel it and take the loss of the banked points if there isn't a vaccine out and draconian social distancing, dining restrictions, ride restrictions reducing capacity to "if you're lucky" status, and low theme park admission rules are in place.
I've read the recent Orange County rules, and wonder how manageable lines would be for rides and shows if people are required to distance 6 feet. For example, the 50' long line for Haunted Mansion would have to extended to about 200' long because the space is narrow. Likewise, once you get in to the stretching room, instead of 60 people, you might have 15, greatly affecting capacity of the ride. The only way I see this working is if Disney greatly restricts the number of people admitted to the park, and makes every ride fast pass only. Likewise, imagine going to lunch at Columbia Harbor House, with its 9 ordering lines reduced to 5 and people required to stand 6' apart while in line. It's worse for table service restaurants, where half the tables would have to stay empty.