When you start an article about college football attendance with a citation about a University of Minnesota home game, you're really not very bright.
Minnesota plays in a relatively new stadium on campus. Capacity is around 50K. They do not expect to sell out and rarely do. And they don't sell out for lots of reasons.
1 - The university is enormous and has plenty of alums. But many alums don't spend all four years living on campus, and most people here who didn't go to the U did not grow up rabid Gopher fans. A good comparison might be the University of Maryland only the U is located smack dab in the middle of the metro. I could literally walk from the Gophers stadium to the new Vikings stadium in about 15-20 minutes. The campus spans the Mississippi River between Minneapolis and St. Paul.
2 - A lot of Minnesotans end up attending Wisconsin (better school with in-state tuition reciprocity), Iowa, Iowa State, North Dakota, North Dakota State, etc. Any loyalty those people had to the Gophers goes poof.
3 - This is a pro sports city. Vikings, Twins, Minnesota United, the Wild and the T-Wolves - they all suck attention away from college sports. And, to be clear, we are not a huge market. I think there are under 4 million people in our metro area. Plenty of things to divide attention here.
4 - This is, rather uniquely, a hockey market. Pro, college, high school and even youth hockey. And, make no mistake about it, November counts as hockey season here.
5 - The program is mediocre and has been mediocre for many years. There is no big natural recruiting base. And the few stellar recruits that are from here are prone to go to schools where college sports is the ONLY game in town. Wisconsin, Iowa and even, occasionally, places like Alabama or Ohio State.
6 - Fans here are legendary for being fair weather. Combine all of the above with that fact and making attendance gains is tough.
Not saying there aren't issues with the sport elsewhere, but this is a really poor place to measure the health of college football attendance in any meaningful way.