Of course, competing with the reengineering of cities you propose is the trend toward remote work which I think will only grow. Most of the well-heeled jobs that have driven up the cost of housing in large cities can be done elsewhere. When the choice is to pay $1M for a 1200 sq ft apartment in the city vs the same amount in rural New Hampshire to get a castle with a barn on an acre, the funding needed to reengineer cities may flow elsewhere.