That's true and a good point, but the article also quotes a Mexican grower who says the bulk price has come down about 50%. That's money right out of the cartels pockets.
Pivoting doesn't come without any cost, focusing on other products means large investments in infrastructure, which was earlier set up for marihuana and became unprofitable. However you want to look at it, it's a loss for the cartels in the short term. In the long term, it depends on what they decide to focus on; hopefully, we'll legalize that next thing before the cartels start making a huge profit from it.