[downrightmike]

You have to remember that in the time when suburbs were being created, most people in the city did want to escape it. The white flight was a huge change. And once the whites left cities, cities drove out poor people and put them into Projects. For a while later, in the last century, downtowns were pretty much deserts with the wealthy living in pent houses and everyone else either suburbs or the streets. It is only in the last couple of decades that cities have become able to attract the grand-kids of the suburb generations back to the cities. Largely because that is where profitable work is located. It is a feedback loop.

Also humans don't work well on the larger scale. Nimbys exist because that is the scale human people can operate at. A million seconds is 11 days, a billion seconds is almost 32 years. Maybe IBM could use Watson to figure out the housing crisis. A few less variables there to work with than cancer.