> So, the only people who can survive in that business are these large Medellin cartel kind of people who have enough money so they can have fleets of airplanes, so they can have sophisticated methods, and so on.

This is actually the opposite of what's going on in Mexico. The large drug organizations have splintered into regional groups. There is no need for fleets of planes, Mexicans drive drugs the border and smuggle them the same way they have for hundreds of years. (Through underground tunnels, empty parts of the desert, and by bribing/sneaking in through customs.)