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Sorry. Not buying your argument. Detroit especially has massive amounts of usable land that simply needs to be leveled. Multiple square miles of trashed unlivable houses. There is land-o-plenty.
The reason that Honda / Toyota / Nissan , etc. is not in Detroit is real simple.
No union scum. UAW - United Against Work
Sit down and figure out the cost of demolishing a thousand acres of existing buildings and infrastructure, and then compare it to the cost of building on undeveloped land.
Then see if you have two of the most critical off-site needs for a major auto manufacturing facility available in the middle of Detroit: (1) Class I railroad access for outbound shipments of finished vehicles, and (2) proximity to an intermodal rail terminal for inbound deliveries.