Back around 2003 or 2004 the NCAA changed the definition of an FBS conference.

At that time a FBS conference was simply a conference that had at least six members playing football that were FBS and it did not matter if any of them were in the conference for any other sports.

Now an FBS league is one where there are 8 full members who are FBS and play football in the league. You can have football only or non-football members as long as you have the 8 core FBS full members.

What if the NCAA in its push to "deregulation" allowed leagues to be deemed FBS simply by having 8 FBS members and might or might not sponsor any other sports and allowed a league that played ONLY basketball to earn an auto bid as long as it had the required number of Division I members.

I think outside the P5 you could see some conferences of convenience. Giant footprint football leagues spread over a huge geographic range, big footprint basketball leagues spread over a big geographic range and then compact regional leagues for the rest of the Olympic sports.