I mean, it wouldn't exactly be unprecedented. New cities spring up and old ones die every few generations or so when we go through logistical churn. When the ol

I mean, it wouldn't exactly be unprecedented. New cities spring up and old ones die every few generations or so when we go through logistical churn. When the old passenger rail system died off, ghost towns emerged. When the old pre-interstate highway system was obsoleted by the interstate system, ghost towns emerged. And I imagine as we shift the way we build things and where value is generated geographically in this country, ghost towns will probably emerge. The nature of low-density suburbs and exurbs is that it doesn't take a lot of people leaving before they become unsustainable. I feel like Americans should be more used to this.