I don't want theaters to die out. But I'm also not going to put myself near dozens of people breathing down my neck.
Even if there are few people in the theater, the problem is that there are seats above you, and that stuff can travel pretty far.
Incidentally, I was in an empty cinema theater one time. Well, me and my friend were. It was in the early 2000's.
I think it was empty because we went to re-watch a movie after it had already been out for a while, and it got moved to one of the smaller rooms.
I'm not sure when I last went to the cinema though. I think I saw something after Detective Pikachu, but I can't remember what.