Pure remote companies are likely to be rare. But we may see a proliferation of hybrid companies that maintain office spaces but allow certain roles to work remotely most of the time.
I think your analysis here is one-sided and is ignoring all the major problems with 100%-work-in-office cultures. Housing costs are absolutely out of control in major urban centers, and newcomers are sacrificed at the altar of NIMBYism in order to make existing homeowners/landowners wealthier. People are wasting away commuting hours a day. Folks have been getting crammed into denser and denser open floorplans and bullpens for years.
People are willing to put up with these things when they don't have any other options. But when other companies are investing in supporting hybrid environments and you're stuck still requiring people to relocate to San Francisco permanently, you're going to start losing talent. Not supporting some kind of hybrid remote policy is going to become a serious competitive disadvantage in the talent market. You can still maintain your trendy urban office space to attract the college graduates who want that lifestyle.