What is driving this insanity? The gas companies?
Also if you are going into the office less then things like air travel and hotels also suffer. If you don't go into to your own office, why travel to another company's office?
Adults spent a lot of time at work. A surprising portion of the economy exists just to support this second space, often in high cost areas.
As an added bonus, the company may benefit from a quiet layoff. If you do an RTO with no exceptions, then some of the staff will be forced to resign. All the company has to do is look through the employee database and get a reasonable estimate of the impacts. In the case of the company I work for, they exempted people who lived over X miles from an office facility - so they weren't looking for a quiet layoff. They just wanted those sweet tax incentives.
Lot of people I know treat WFH as unofficial vacation days.
This is a management problem, but that doesn't mean it isnt real.