Brief thought exercise: could modern-day San Francisco someday go the way of Detroit?

[youtube https://www.youtube.com/watch?v=oXxJW6NgX6A&w=620&h=315]

This isn't going to be the most informed post of all-time; it's mostly just a set of potentials and theories. Still, I think it's interesting to consider. Start here: you can make an argument that, in the pre-war period and perhaps into the 1950s-1960s, Detroit was maybe the economic cente…