While everyone is still lamenting the "legalize mary jane and the problems go away", let's not forget the other choice activities that generate about half the cartel's income:
- - includes the sale of methamphetamine, cocaine, and brown-powder and black-tar heroin.
- - kidnapping has become their second-most-lucrative venture, with the targets ranging from businessmen to migrants.
- - Another new source of cartel revenue is oil theft
- - Cartels are also moving into the market in pirated goods in Latin America.
- - cartels are also moving into extortion.
https://www.nytimes.com/2011/06/19/opinion/19longmire.html
Sure the cartels will take hit initially, but those intervening months between legalizing and having RJ Reynolds start churning out cig packs of pot (or even for local growers to have enough to deal with the increased demand) the cartels would be shifting. Already the cartels operate near slave farm operations in the US national forests - what makes you think they would stop? The price might be a bit less but what's the cost to people who do not care for human life? Labor is cheap at the end of a gun barrel.
Per the OP's article these guys are no joke. They are not just some street thug but freaking trained troops. They have gone far, far up the Nung River, and I doubt they will go away any time soon.
They were formed by former special forces soldiers who deserted from the Mexican Army and joined the Gulf Cartel.