The 70s:
Big Ten: UM and/or OSU all 10 years, with MSU a share 1 season
SEC: Bama 8 out of 10 years
SWC: Texas 6, with UH and Ark getting a pair each
Big 8: UNL or OU all 10 years, shared with others in '76
PAC-8: USC 6, Stanford 2
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The whole decade was an annual blueblood convention in the top 10 each year. Add to that ND being a top 15 team in 8 of the 10 years, with 2 NCs.....and yeah.
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The problem with what may transpire now is that all those big-boy programs separate, but don't have the have-nots to fatten up on. They'll all feast on each other and it will create a new bell curve, with some pretty sexy programs on the wrong end.