The ghetto culture works against all of that.
I would like to see certain cities (Detroit, Newark, Baltimore, etc.) attempt to create a new way forward -- they should all try different approaches to see what works best. I would recommend local businesses (there isn't going to be a steel plant, an Intel microprocessor plant, or an Auto plant employing 20,000 people), community urban farming, and true neighborhood policing. Make a place like Baltimore into something like a City State where the people in the city didn't depend on the feds or the state, or rich workers commuting in from the suburbs. Find a way to take the current demographics and build a system where they simply have to stand on their own two feet as individuals.
You're not going to return to Detroit in the 1950s -- which was quite a good place. Find a way to create a 21st century on a new model. We don't know what that looks like -- we need to find out. Not every city can be Manhattan. And no city should be Baltimore.
Hmmm sounds like Chicago in the book Divergent.
Interesting points. The problem is that the Democratic Party and the political caste of those places have a vested interest in resisting any change and crushing any new ideas.