I agree that much of what people (from all sides of the 'issue') are dreaming in technicolor.
However ...
I expect that with a 4 plant per household option, then any compitent gardener (tomatoes anyone?) could take care of their own needs.
Bold prediction: Community colleges will offer "how to grow and harvest your medical marijuana' night classes.
Community 'gardens' may even spring up.
The social media sites will make a killing on advertising alone.