Once a core group decides who they want to be associated with they extend invitations to those schools then announce as a group they are moving to the NAIA. The NAIA would be more than happy to figure out a way to keep the unwanted out in order to maintain a payday that while perhaps smaller than the NCAA would be a boon to them. Even a quarter of what the NCAA steals from March Madness would do the trick and would satisfy both the majors and the NAIA.