I don't think WFH will be as popular (for employers nor employees) as people seem to think. At the moment due to Covid, it's a compromise to at least keep things moving. Long term, though, I think the reduction in efficiency, longer delays, etc will push employers back to wanting staff back into their normal workplaces, maybe not full time as previously, there may be more flexibility to WFH for part of the working week.
I've been working throughout, and dealing with governmental organisations, businesses, banks, etc on a daily basis. You can tell who is WFH and who are back in the office. The WFH are typically slower to respond, more mistakes, more delays, etc etc. We can excuse that in the short term due to covid, but when things get back to normal, people won't put up with inefficiency, delays, etc. I've got jobs on the go where I've been waiting for information/reply for 3/4/5 months which is really starting to impinge on other people. Yes, some of that will also be due to people furloughed, shielding or whatever so maybe fewer workers, etc. But WFH is also clearly causing inefficiencies.
One example, I phoned a Govt agency, very long wait for phone to be answered. Then, apology after apology during the phone call as their internet was slow, then they had to put me on hold as someone was at the door, then they hit a snag and couldn't do what I asked on their computer as they didn't know how to do it and there was no one at the "next desk" they could ask as they would normally, so they suggested either I call back and hope someone else would answer who knew how to do it, or that she could escalate it as a problem for the supervisor to look at, but she didn't know if the supervisor was working that day (in the office, she'd know as the supervisor would be there!).
WFH is a sticking plaster at the moment to keep things ticking over, but realistically, most people will be back in their office most of the time when Covid is over. Yes, as I say, there'll hopefully be more flexibility for say 2 days office, 3 days home, and I'm sure some employers will embrace WFH and improve systems to make it more efficient for those who want it.