Nope. Demand for guns in Mexico is higher, and will remain higher as long as there is a higher degree of criminal activity there. I don't think you'll see some guy wanting to rob a liquor store in Phoenix outbid a guy shipping $14,000 worth of cocaine from Chihuahua to Juarez on the black market for a gun. For that to change, something will also have to change on the drug front.
EDIT: For clarity (new in italics)