If remote work does lead to people abandoning cities en masse, the climate is a huge loser. All of a sudden you have people who are moving to more remote places, who will likely be driving instead of using public transit, buying bigger homes with extra work rooms, and so on.
Instead of reversing the 1960s trend of suburban developments, wfh will only accelerate it. No climate concerned person would cheer that on.
The one good thing about remote work is that it does reduce business travel. Maybe that’s enough to make remote work climate neutral, I don’t know.