As far as I can tell, every state that has legalized allows growing at home. And, unlike making beer or wine at home, anyone can grow more than a year's supply in a small plot in a backyard. After all, weed is, well, a weed. It is easy to grow.
Sure there will always be commercial, licensed operations when it is legal, but the check on prices is going to be home-grown. And, there is already an effective underground distribution system. I just do not see a high profit in commercial sales and distribution.
People who are too tired and get free money and who have amotivational syndrome will buy it and there will enuf of them to fuel lots of businesses...
To parody and update Marx...”psychotropics are the religion of the masses”