I wonder about the assertion that these are WFHers and not a bunch of useless middle management and above types with nothing better to be doing.
Plus, BS jobs aren't a new phenomenon. There's no shortage of people whose jobs comprise maybe 2 hours of actual work a day, and the other 30 hours are basically just done for looks/tradition. WFH allows everyone to give the 40 hr desk-sitting tradition a five finger salute and everyone's happy; the work gets done, and the worker doesn't have to spend 3/4 of their time twiddling their thumbs. Plus, the business doesn't need as large of an office.
Most gargantuan businesses own the property. Following that, if wfh becomes ubiquitous, their property is devalued and their investment is worth less or worthless. Doesn’t matter whether this would improve the bottom line in a year or two, the next three quarters is everything. Growing the business is irrelevant if you are replaced or fired for your foresight.
Easy middle ground is hybrid work. You get to see your coworkers faces in person occasionally plus everyone gets all of remote work benefits. It's win-win-win