Let's pretend for a second that every year the FBS kicked out all the schools performing at the current UL level and below. OK? In 20 years the remaining 10 schools couldn't fill out a complete schedule.
Instead the most valuable part of FBS "The UL's of the world" need to quit playing so many money games in which they are afraid to bring their "A" game and two things will happen. (1) Their income will rise through the roof (2) The perception that they need to drop down to FCS will disappear.