I like your approach, which could also be stated as "either build more if you're going to charge 0, or else charge based on privacy/demand"

This would force employers to look at flexible hours, work from home, etc., to keep employees.

Ive often thought how strange it is that the marginal use of a road is free...which can cause waste, abuse of the commons, etc.

It's also strange to be on a high floor in SF, CHI, NYC, etc., And look down at the grid of streets that could be valuable real estate...yet something like 50% of all and (and the air space above) is dedicated to hundred-year-old technology!