However, this is likely a problem that will get worse, not better, over time. The early WFH experience was able to cruise on the office connections, cross-training, personal knowledge, team-building, etc. that had happened previously. The longer people are away from the office, the more that hard-to-quantify stuff will decay. Plus, onboarding a new college grad has got to be challenging when there's not a group of experienced team members around them to be able to see when they're struggling or headed off the wrong path without realizing it.
All of these problems can be mitigated, but they won't be eliminated. There will always be some positions and employees where WFH makes sense; as I said, it has often worked for me. But the idea that half or even a quarter of employees would become permanently WFH, is fantasy. It's kind of like having a long-distance relationship. You can do it for a while, but the penalty mounts over time in ways that are hard to quantify, but real nonetheless.