The question is, with legal pot, does the demand for meth and coke go up or down? All of this is demand based, something the drug war people never seem to grasp as they continue to go after the supply.
The more you limit supply, the more value the material gets, and the more people will try to provide that supply, violently if need be.
It would depend on whether they are complementary goods or substitute goods.
My point is that drug networks will look for new products to sell to maintain profits, like any business.
Yes, but they need a product with a demand, and subsequently a profit that meets the needed risks taken.
The profit margin you get from undercutting the government is no where near the one you get from ignoring the government, because one has a price cap (i.e. the government regulated price of the product) and one does not.
A portion of the former illegal growers/sellers will go into legitimate business, and yes a portion will go into harder illegal drug sales, but now that the cops don't have to sweat pot as much, they can concentrate on the hard drug networks more.