It is apparent there is a divergence between the major conferences. For that matter there is a divergence within conferences. If you examine the records of the teams from members of the American Association of Universities you will soon find that recent national champions do not occur with any regularity. Four of the last five will be won by non-members. In the prior five years to the last five Florida, Texas, Ohio State, and USC did win the national championship. But scandal surrounds two of the four mentioned.
If you look at conferences the ACC, Big Ten, and PAC 12 have more AAU members percentage wise than the SEC, Big 12 and others. Notre Dame is a shell of what it once was and its academic standards are being partially blamed for the decline. It is obvious that institutions more inclined to emphasize graduate education are less competitive on fall Saturday afternoons.
Look at the Big 12 conference and see real divergence. For most of its existence AAU members ISU, A&M, Mo, and Ks were lower tier in the standings most seasons. While Texas and Nebraska exhibited success and were AAU members it was Oklahoma that frequently ruled in football. The PAC 12 has a similar pattern.
This new period is very reminiscent of the 1960' and 70's. The Big Ten operated under vastly different rules, one team went to the Rose Bowl that was it. Each Big Ten team could recruit 30 players each year while every other conference could recruit 45. Academic entrance requirements for the conference were greater than the NCAA minimum and each university set higher limits than the conference minimum. The Big Ten was really reeling before it opened itself up to more teams going to bowls and the NCAA lowering the number of scholarships for football.
Many things could change by 2014, one is the institution of higher entrance and eligibility standards by the NCAA. The other is determining bowl eligibility based on the graduation rate in addition to w-l record. While some want this to be only about football it will never happen in the Big Ten.