One thing I wonder about: We often hear people say stuff like, "There are 65K influenza deaths each year and we don't change our lives too drastically because of that." And that's true ... but I wonder if, post-pandemic, we'll still be as willing to ignore those deaths. It's a little like the thought experiment of, if we had never invented cars and you introduced them tomorrow as this amazing invention that, oh by the way, will kill 50K Americans each year, no one would consider that acceptable. I just feel like the fact that Covid has made us so much more conscious of deaths from respiratory viruses means we're not going to just go back to accepting the status quo.
To be clear, I'm being descriptive, not prescriptive. I have no idea what we should do. Nor do I know what "not accepting the status quo" will look like. Presumably lots of people will continue wearing masks to some extent. I also imagine that there will be much stronger social pressure not to "tough it out" and come into work when you're feeling under the weather. I'm sure we could all come up with a bunch of other changes that will become the new way of doing business.
All of which is to say I think the "return to normal" will be very gradual and, in some ways, incomplete. Which I know wasn't really the question, just something I've been thinking about lately.
As for the virus itself, the historical precedent suggests pretty strongly that it will weaken over time and become a seasonal annoyance.