Well it might be working for Mexico but not so much here!
I think it will be working when there is less than the one drug related murder per hour that Mexico's population suffers at the moment.
They are not stupid - like water running down a hill hey will take the route of least resistance.
That is why, for example, a lot of the cocaine smuggling has shifted from Haiti to D.R.
The UN clamped right down on transhipment in Haiti and the Dominican authorities seem at best to be less efficient at dealing with it and at worst seem to embrace the trade - even to be complicit.
And anyway, these Cartel guys are probably fed up of living in Mexico what with all the drug violence.
But let us never forget - the only reason it is shipped at all is because there is a huge market for it in North America and Europe.