I am inclined to agree with the argument that a successful vaccine and time will have people returning to the theatre and other 'close quarters' events, because people will not want to forego those things indefinitely.
On the other hand, I always thought it was interesting that -- pre-pandemic -- if you saw any movie, documentary, news story, etc., that as filmed in eastern Asia, e.g., China, Korea, Japan, you would see lots of people walking around with masks. I would not be shocked to see a sizable number people who are willingly wearing masks today (vs. the idiotic deniers always citing that their civil rights are being violated) continuing to wear masks at crowded events where people are going to be on top of you. Probably not true, but I would not be surprised if it occurred for a decent amount of time post-vaccine).
The flaw in this argument, of course, is that the people sitting behind Dame at the Music Box will not be wearing masks and they will be the ones coughing up a storm, so it won't necessarily matter if Dame wears one. Hopefully, they will only be sharing their common cold or occasional flu (assuming we have a fool-proof vaccine).