JANUARY 4, 2017 —Fans in the stands at the Allstate Sugar Bowl in New Orleans Jan. 2 might have wondered where everybody went. The announced crowd of 54,077 fell far short of the seating capacity of the cavernous Mercedes-Benz Superdome, which holds more than 76,000. Vast swaths of seats sat empty. The attendance figure was the lowest for the Sugar Bowl since 1939. But it was hardly alone. The Camping World Independence Bowl, held each year in Shreveport, La., brought just under 29,000 fans through its turnstiles, its worst attendance since 1988. The Goodyear Cotton Bowl Classic in Arlington, Texas,...