Don't you know supply and demand? As long people will want drugs, it will be interesting for them to sell drugs.
That's not how supply and demand work. People have limited capital. They utilize capital to maximize returns vs. risk. The cartels sold drugs because they lacked capital for legitimate business endeavors, and legitimate businesses were prohibited from participating in their industry.
Both of those circumstances are changing rapidly. Furthermore, the illegal drug industry has the same immiserizing effects that plague agriculture.
"Drug cartels didn't enter legitimate businesses because they lacked capital." I assure you all that by the time drug dealing organizations developed to the 'cartel' level, they had MORE than enough capital to aggressively enter any legitimate industry they chose (and in fact already owned substantial swaths of private businesses _ that point).
Even by Arrogant Demand's standards, this is one of the stupidest things he's ever posted.