For example, offices could be changed to provide some of the benefits of home. Napping could become normalized, for example. More child care facilities could be provided. What else?
Hours could be adjusted, so parents are home when their kids return from school: Instead of distributing hours in full days at the office or home, how about being at the office 5-6 hours/day and at home the rest?
Hours could be more flexible, normalizing people running errands and doing other things during the day.
Dress codes? Pajama Fridays? What else?
EDIT: This HN thread and many others are filled with arguments for working from home. It's a hot topic and you can find them all elsewhere. Here I'm asking a different question: How can offices be improved based on what we've learned?