Rural Mexicans, particularly young people, are leaving farm work, just as U.S. workers did in the last century. The end of farm labor abundance means long- term changes for wine producers. Increasingly, being competitive in the wine industry will require mechanizing the most labor-intensive tasks and taking steps to secure access to a smaller, more loyal and more skilled workforce.
See article here: Adjusting to an Era of Farm Labor Scarcity by J. Edward Taylor and Diane E. Charlton. Wine Business Monthly, December 2014