Alternator/generator/regulator problems of the 2005 Mazda Tribute

My 2005 Mazda Tribute I-4, with 19,000 miles on it, experienced an alternator failure. The battery light came on and I was advised by the dealer to bring the car in because it might die. My vehicle is now being held for about a week, because they have told me that alternators for this vehicle are back-ordered. I wonder if they are back ordered because other failures have occurred at very low mileage on the vehicles.