One interesting solution would be let the city default on it’s debt and then auction remaining holdings to the highest bidder and let capitalism rebuild it.
Capitalism can only operate in an environment where private property is defended against expropriation.
The only thing that would work for Detroit would be to forever bar residents from receiving any sort of means-tested government assistance. No welfare, no food stamps, nothing. If you need means-tested aid, you would have to move elsewhere. Wait a year for the Democrat constituencies to leave, and then you could start to rebuild.
They are in Bankruptcy which is a form of default. The court can order the city to liquidate many of its’ assets and probably should.
The biggest ruling would be a forced end to the Union contracts and elimination of the pension liability. If the retirees complain, tell them what happened to the Steel Workers Union Retirees. When the host dies, the parasites do as well.