This is news because of the runaway popularity of the Locos Tacos, but Doritos has had Taco Supreme Doritos in the past, part of their Late Night/nightmare set of Doritos varieties that included Pizza Cravers and, horrifically, Cheeseburger at Midnight.
Wait until they start making the Locos taco shells out of the Taco Bell-flavored Doritos. It will be the ultimate fast-food ouroboros; the serpent that eats its own tail for Fourth Meal.

