That's the same week I'm booked for! My first day will be 11 months from today. (sigh, but I am thankful for the opportunity to go, even if that means waiting a long time)
I, too, worry about how things will be in Nov 2021. However, I keep telling myself that it probably wont be worst than the current situation we are in and WDW is still open and people are having a great time there. By then, irregardless of how you feel about the vaccine, millions (or tens/hundreds of millions) of people will have been vaccinated, there will be 11 more months of studying the virus and 11 more months of development of therapeutics to aid in recovery and treatment, etc.
While I don't know how much our experience will be like it was pre-COVID, and we probably won't be experiencing WDW post-COVID in Nov 2021, I do think things will be closer to normal .