There are a population of people originally from China near where I live, and for years I have occasionally seen some of them wearing masks in the winter, especially on public transit. I'm not sure if they were sick or if they were particularly worried about getting sick, but once it becomes normal, I think it'll stay normal for many people. I honestly don't even notice my mask anymore. But then I have a hard time envisioning a future version of myself who feels comfortable moving freely around the world again, so who knows what that hypothetical future person will do.