Just for fun. If it's not fun for you, don't participate.
Who would be the current, "as of 2020" League of 15 for college football and separately, who would be the all-time 15?
For now, I'd take into consideration current state of the program, general recruiting ability, ease of improvment, etc.
For all-time, it's honestly win% + NCs as a bonus. Ex: Miami doesn't measure up on all-time win%, but their NCs trump Michigan.
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Now:
Alabama, Clemson, Ohio State, Oklahoma, Texas, Michigan, Georgia, Florida, Oregon, LSU, Auburn, Penn St, Miami, Florida St, USC
No, some of these don't deserve it on results alone, but in lieu of programs taking their places, these programs simply need the right HC to become juggernauts. The rest belong based on results.
Just missed: A&M, Wisconsin, Warshington, Virginia Tech, Notre Dame
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All-Time:
Oklahoma, Nebraska, Michigan, Ohio St, USC, Texas, Penn St, Tennessee, Notre Dame, Georgia,........then it gets interesting....Florida, FSU, Miami? Arkansas? Let's say those 4 and LSU.