I believe the problem with adding Boise State is their academic standards are below what the PAC-12 requires.
Correct. BSU isn't a research center and 60% of students accepted have less than a 3.5 high school GPA. Their endowment is 95 million. By comparison, Stanfords endowment is 21 billion. USC 5 billion. Cal 3.9 billion. etc, etc.....
Stanford, Cal, USC, UCLA, and UW would never allow it till BSU becomes a serious research center and gets that endowment way up. It's the same reason the PAC16 would of never happened when the PAC commish was floating the idea of Texas and Oklahoma joining the PAC, but Okla St. and Texas Tech were part of the sell as well. Texas Tech and Okla St. are JUCO at academics. Stanford especially said no fucking way in hell.
BYU has been begging the PAC for years to join, but keeps getting rejected for other reasons. They got the academics and endowment, but the California schools would never allow a member to have that "religious honor code" gaga. Especially Stanford and Cal who both would say no way.