It doesn't completely match the topic, but how about the move toward non-airline affiliated club rooms? Since no airline will operate a club here, Fresno (FAT) is currently adding a private members-only room for business and frequent flyers.
Lincoln (LNK) already operates the Lincoln Flyers Club for "Nebraska residents who are premium level members of an airlines Frequent Flyer Program and customers who fly 12 times per year or more from Lincoln "
That may be the smallest airport with any kind of VIP Club. Or does someone know of anyplace smaller?