An interesting factor is how this is dependent on how confident we can be to continue WFH.
Like many people, I'm nowhere near prepared to have a good home office, the house is way too tiny. Which was fine when I didn't WFH more than a few days a month.
But I could easily solve that by moving to a cheaper area where I could get a house with enough space for a dedicated home office. But to do that I need to be confident WFH will continue. Hard to predict what to do.
(So what I've done in the interim is lease a small office walking distance from my house, lots of vacancies right now.)
I had this problem and spent a few months working on the couch before buying a desk and office chair - I dropped a few thousand on these things alone. What gave me the confidence was the introduction of a WFH allowance and news a few people around the company had moved to the countryside.
Certainly not everyone.
At my employer a VP produced a report for 2020 showing how his division had increased both productivity and response times across the board by a non-trivial margin due to WFH.
Doesn't mean this generalizes across all teams but certainly at least some are seeing such data.
In the morning, I don't need to commute an hour to the office, giving me an extra hour of sleep. My workspace is also superior to what I'd ever get in the office.
But the biggest boost in my productivity has come from the lack of distractions when working from home. If I'm trying to focus on something, I can set my status as busy and mute notifications, leaving me to work in peace without interruption.