Our office is back to about 70% capacity. Traffic has returned in the morning. Public transit isn't as full as it used to be, but there are lines to get onto the busses in the morning where I live. Again, probably 70% of what it was before.
That reduced 30% has made the commute in quite a bit quicker I'd say. Price for parking is equal to public transit (I can't say if it was like that before because I didn't have a car before covid).
Sure, lots of offices won't return, but I think not as much as you expect. Our company is 3 mostly introverts. We'd likely be the first people to say "screw it, I don't want to be around people, I'd rather just wfh", but we're all really enjoying being back in the office. We know we're more productive this way too.