Yep our office is going to move to rostering teams in on different days of the week. I confidently predict that system will be abandoned before the year is out.
In any event I’ll be going in Fridays and probably Mondays too.
I guess there's no one-size-fits-all approach and different businesses will work out what's best for them, and their staff.
I can see some businesses allowing staff to work from home as much as possible, but requiring them come in for meetings/brain storming and to socialise (any business that doesn't do this risks staff becoming isolated and detached, and perhaps leaving as a result - plus productivity going down. Another factor is how people will eventually become separated from their colleagues, especially when people change jobs and you've potentially never met someone you 'work with').
Meetings are much better in person than on Zoom. We've said for years that fast Internet would make everyone work from home; well, now we've been able to try it. It works for a lot of things, but it's not the same when you can't meet up and chat before and after a meeting, or even have quiet chats during a meeting!
Perhaps those against HS2 because we didn't need a new railway line as we'd all work from home is now proven to be needed after all. Not everyone wants to work from home or spend hours on video conferences!
What will make sense is to allow staff to be more flexible on working hours, which might mean the traditional peak periods never return.. but a lot of businesses may not want to do that as some jobs need people to work set hours, so coming in at 6am to go at midday (or whatever) won't really suit the business.