" fair, orderly ,safe marketplace"
This will be interesting. 
A product that is quite easy to grow , much less production barriers than booze or tobacco. How big will the "grow your own" become? How do authorities ever hope to regulate 2,4 ,6 , 8 plants???
Well established , underground , distribution channels. Do we think all the folks that have made a living, for years and years,  from growing pot and distribution will just " go away" ?   People will fight for their jobs. Can we expect to see a constant " price check on aisle one" as  gov't and industry starts to add extraordinary taxes and profit margins on to the price of a simple agricultural product. Colorado experience..
Where will the " dark side" of the industry turn to next for revenues?
Will consumption take the steep upturn that the industry is predicting? Is 4/20 likely to be our next statutory holiday?
Its a bold move, good luck for " orderly".