I agree with the premise that organized crime is not going to disappear when we end drug prohibition. The fact of the matter is, however.... Again, don't take my word for it. It is the criminal intelligence service telling you this. Each year when it publishes its annual report on organized crime, it tells you very clearly that the primary funding source for organized criminal groups is the prohibition on illegal drugs, and the marketplace is their spawn. So if we take away that money from these groups, they lose power. They also, as Mr. Amar has pointed out, lose a massive recruiting tool for future generations.
I don't say that ending drug prohibition is going to solve all of our problems as a magic bullet today. I'm looking 20, 30, or 50 years down the line, when we see that by cutting off the major funding source of these organized criminal groups, we cut off the incentive for people to go into them, and we decrease their power exponentially.