I think some will return to as they were but not all. It will vary by the demands of a given profession, individual work habits, and company culture.
In my profession we found that not only could we work effectively remotely but our team was actually more efficient so my employer has already told us they plan on cutting back office space and keeping us remote.
That leaves me wanting to do more to make my home office a better work environment. However there are no longer any tax breaks I am aware of to help with that expense. Oh well, I do save a good amount between commuting and eating lunch out now so I guess that is what will go towards refining the home office.