When the Big 12 was looking for a school to replace Texas A&M, the one school that was mentioned frequently was BYU. It made some sense in the fact that since BYU was already an independent in football, it might not have to make a lot of changes to bring its football program to the Big 12. Of course, TCU was then named the newest member of the Big 12, and now you're not hearing all that much about BYU as much as you do schools like West Virginia and Louisville should the Big 12 add more teams.
Why is that? Well, according to a report in the Salt Lake Tribune, the Big 12's television partners put the kibosh on BYU.
Although BYU’s flirtation with the Big 12 may yet be renewed at some point beyond next year, The Salt Lake Tribune has confirmed what the Tulsa World first reported on Oct. 7: Big 12 talks with BYU hit a snag last week and the league, at the behest of its television partners, quickly moved to invite TCU.It seems both ABC/ESPN and Fox Sports also had problems with BYU's policy of not playing sports on Sundays. Not for football as much as any other sports the networks might want to televise.
“There is some rigidity at BYU in terms of what they will and won’t do,” Tulsa World columnist Dave Sittler wrote, quoting a Big 12 source. “Some of it has to do with [LDS Church] rules, and also the way they engage with media partners.”
In addition the report also says that BYU wanted assurances that an unspecified minimum of the school's games would be televised nationally, and it also wanted the ability to show BYU games that weren't picked up by Fox or ESPN on BYUtv.