people who grow will only be heavy users.
if u smoke 50$ per week, you wont go illegal on it, and u wont do own plants,
the work the time the place, i would never do that if u can buy 20 diffrent strains in a shop..
but yes heavy users will grow their own, but these 1-2 KG per year people arent in the market calculation.
also the most weed will be made to oil, and this i bet will be the place money is gona made