Yep in my head I’m thinking late summer 2021!A vaccine won’t impact Christmas week. Even if one works and is approved in the late fall it still needs to be distributed and people need to get vaccinated. High risk and first responders first then the general public afterwards. The leading candidates all require 2 vaccinations 3 to 4 weeks apart too so even if you started vaccinations as early as Dec (which is not likely) you won’t have everyone done until probably end of March. The best hope for WDW and a vaccine is probably that they salvage Spring Break 2021 by relaxing restrictions by then. More conservative view would be they can ease up on restrictions by the summer season. All of that is based on a vaccine working and the trials to have a positive outcome.