I was reading an article on The Athletic and they were saying some of that loss could be contributed to the fact that there were only 2 out of conference matchups between ranked teams.
"It’s no coincidence that average viewership through four weeks was down 11 percent year-over-year, according to
Front Office Sports. Mass numbers still tune in for a big non-conference game like Ohio State-Texas, which drew the largest Week 2 audience on record with 14 million viewers. There just haven’t been nearly enough of them.
Only that game and LSU-Ole Miss (a conference game) have topped 10 million viewers. Last season, there were four such games in Week 1 alone (Texas-Ohio State, Notre Dame-Miami, Alabama-Florida State and LSU-Clemson).
Some of the drop-off can be attributed to bad luck. LSU and Clemson played again in Week 1, but this year Clemson was unranked, and the game was a 51-10 blowout. Alabama-Florida State met again in Week 3 and drew a respectable 7 million viewers on ABC before getting bumped to ESPN2 due to a weather delay.
For the most part, college football has only itself to blame for a ho-hum September slate that turned off fans.
Ever since the move from a four-team to a 12-team Playoff, schools have been canceling marquee home-and-home series and replacing them with guarantee games that most fans don’t care about. Several prominent Big Ten programs — defending national champion Indiana, USC, Penn State, Nebraska and Washington — played no Power 4 nonconference opponents this season, though the Huskies did keep rival Washington State."