I think the hypothesis is mistaken. The bulk characteristics of Detroit's population are certainly relevant to the attractiveness of the city, but it seems to me that even now, there is a wide variation between the different neighborhoods of the city, and you can have improvement in one area without improvement in others. And in fact we are seeing exactly that.
Given that the path to improvement is incremental, there is little preventing a gradual change in the people living in the city, which after all happens naturally anyway. And never is a really long time. On the other hand, the world is much different place from what it was in the 20's or the 50's, so I don't expect some kind of weird retro Detroit to appear either. Don't want it to either.
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