Presumes those blue cities will be able to continue to produce surpluses and deb

Presumes those blue cities will be able to continue to produce surpluses and debts. Do a quick search of the debt of those cities you’re thinking of. They are all in inescapable debt. They just have enough cash flow to remain solvent.
Red cities will raise behavioral standards and CONTINUE to drain people and industries from the cities that are decaying. I mean NYC lost 400k ppl yesterday and California is throwing out business and industry by the planload.