Interesting article from Sports Illustrated. Writer attends games at Florida, Clemson and OSU to discuss with fans the decline in attendance across the sport. Lot of words to arrive at a relatively simple conclusion (in the spoiler for those not interested in the read).
https://www.si.com/college/2020/01/10/college-football-attendance-decline-ncaa
https://www.si.com/college/2020/01/10/college-football-attendance-decline-ncaa
Rising cost of college inhibits students' willingness to pony up even more money upfront for an entire season of games that are largely unappealing now that non-conference schedules are so watered down.