SB Nation has expanded on our discussion of the 3+5 format that would eliminate divisions. Here they show the 3 permanent rivals for every Power 5 team, although they actually advocate 4 rivals for the ACC and pods for the Pac-12. You get the idea. This is totally doable.
http://www.sbnation.com/college-football/2016/6/16/11935718/ncaa-conferences-divisions-scheduling
http://www.sbnation.com/college-football/2016/6/16/11935718/ncaa-conferences-divisions-scheduling