The drought chart above does not show Mexico, but from the looks of it, Mexico will be spared the worst. Maybe the ag jobs will go south.
The world can do without California produce. Its elimination would help to revive fruit and vegetable production in other states. Before the development of refrigerated trains and trucks, areas surrounding the large cities had extensive truck farming operations. Many areas where subsistence farming once existed have reverted to pasture or second growth forest. There is no reason that pastures and forests in downstate Illinois, East Texas, and upstate New York, for example, could not intensify their fruit and vegetable production. Also, foreign imports would increase. A large percentage of fruits and vegetables are coming from Latin America, especially Mexico and Chile.