I've got a friend who now works from home. Took them all of 3 days to set up. And yet they want her back in the office as soon as possible. Mind boggling to be honest. She's saving so much time and money not commuting and still does the same amount of work.
She says she doesn't like it though, the office environment is better. So there's that.
In fact, my worry is that this event will actually impede WFH. You've got a bunch of people who don't want to WFH, or who have kids at home or other handicaps; the productivity hit will be tremendous, and bosses will feel this.
Sure, we can rationally explain it away, but I doubt any of that will stick to a boss who was already on the fence or somewhat against WFH. They will just see their biases confirmed.
My institution has been trying to bring people back in some format since day 1.
My institution also has an administration that isn't comfortable with only measuring results over actual physical time spent in seats during a project.
I know correlation doesn't equal causation, but I'm betting there's a link in this one.
She says she doesn't like it though, the office environment is better. So there's that.