You couldn't be more wrong. 15 schools by themselves die. They need enough schools to play, enough wins to maintain interest, and enough eyes to make it worth it. Do the math. It's not 15 schools. As pointed out earlier, 'parity' in a conference 'nets' more eyes than a lopsided conference of equal size. With this idea of putting X schools in a conference, you better darned have numbers to back what 'X' is.
I think you are misunderstanding what I am saying. Do you think the networks value Iowa State, Kansas State, Arkansas, Mississippi State, Wake Forest, Louisville, Oregon State, Cal, Indiana, Northwestern and the other 40 programs of the same ilk? IMO No. The networks are paying 50%+ of their media rights expenditures to show traditional powers or solid schools with large alumni bases. So like it or not- ESPN, Fox, etc. are paying to televise: Texas, Oklahoma, Alabama, Georgia, Florida, Texas A&M, LSU, Clemson, Florida State, USC, Oregon, Ohio State, Michigan, Penn State and Notre Dame.
There is a next tier like Wisky, Nebraska and Tennessee that could be tier 1 programs if their teams are consistently top 10. Yes I shudder to include NU in that list and could easily be talked into removing them, based on their success over the last 20 years and fact that Nebraska is the 37th most populous state.
I agree 100% that CFB would lose a lot with just 30 schools. It would largely become a regional fan support sport, except of few intersectional games. Much of CFB's love affair by America is that college football fans at 120+ schools all have a connection to the race to be a playoff team. Cyclone fans know this better than most because a very average ISU team beat 2nd ranked Okie State and knocked them out of the playoff chase in 2011. One can also look at Appalachian State beating a 5th ranked Michigan back in 2007.