LOL, If norovirus didn't make people think about the germs and buffets this won't make a dent. Not when the danger is the people at your table, not the food. Possibility of vomiting way higher than what people think their chances are of developing serious COVID.
IMO, capacity will be the first thing that starts to goes back to normal, but still with limits, until we start vaccinating regular people, without comorbidities. That's not going to be until late spring, summer. If the CDC, says places can go to 50%, then they will, but 75%, 100% won't happen until we are farther in the process.
Once everyone who wants a vaccine can get one, then things will start ramping back up, fairly quickly. Attraction shows, fireworks, character meet & greets, things Disney wants to monetize. Especially, if we could get a QR health code that could be imported into MDE. Then your green Mickey means you have been vaccinated and not just you have a FP or want a Photopass photo. If I were Disney I would be hoping that I can partner 50th anniversary campaign, with "we're back, baby." So October.
But I don't think mask usage goes away, completely until 2022. It may not be everywhere. But if you are on transportation, wear a mask. Put on your mask as you enter a queue. If you feel like a sardine or livestock, wear your mask.
Everything's not going to come back though. I am not as optimistic on a timeline of full recovery. Disney could get back up to 75%-80% of pre-pandemic levels pretty quickly. But it will stall, before reaching 100%, and be a grind like post 9/11 was, only worse. This is going to leave a lot of entertainment and free experiences in deep freeze.