I adore working from home and it would suit me much better (once nurseries reopen) not to have to commute across London – the money and time saved would genuinely change my life.
But, I'm lucky to have the space to have a small wfh set-up that's separate from DP's wfh set-up, whizz-bang WiFi, and a job and personality that really doesn't require human interaction. Though I do think 1-2 days per fortnight in the office for an all-team catch-up would be valuable.
It's not necessarily workable for lots of people unless their company provide not only the hardware and software but also contribute to better internet connection and proper desk/chair, and even then if you're in a shoebox flat or houseshare it might not suit.
I can see lots of businesses ditching the big expensive centralised building model, though. The problem is they can't share buildings or do shared workspaces, smaller building with hot desking, etc, because of the nature of the virus. Once the Corona element is solved (vaccine, herd immunity, the impact peters out, or it just becomes a thing we're used to), I think most business that can support 80% WFH will do so, with small, localised, shared workspaces for people to hold meetings but without the real estate bill.