When this law first passed there proposals in Lansing to take over the growing and regulate it.
Those paying attention learned that the players were all well connected greenhouse industry biggies.
Once you start asking them for large scale pot growing you lose control if they agree.
But none of that shit matters anyway - you can't even begin to fix Detroit with it's land mass of abandoned and vacant properties equaling all of the property of NYC and Phily.
The city has more abandoned and derelict property than most other American cities have property!
Therefore you need to segment it and enable 'settlers' to resettle it in some way.
You might be able to do something like that if you invested in clearing land and passed legislation to make it possible.
Immigrants are often the hardest workers - and it would require people that would work - they also feel safer among their own until settled.
Look at Dearborn now, or the Hamtramack of old, or any number of other ethnic or social communities if you disbelieve me.
I just think it would be more managable to create enclaves that are expected to exert local control rather than try to rebuild that cesspool in one feel swoop.