unless temple goes Big East like Nova did i dont see the other philly schools going away from the school that really brings in the revenue. I have a somewhat similar list but it might be too big with 14.
VA/DC
VCU, Richmond, ODU, GMU, GW
PA
Temple, St. Joes, Drexel, Lasalle
OH
Dayton and Xavier
NorthEast/NE
UMASS, RI, Northeastern
This could change as people said with football programs and the like, but it has natural rivalries and pretty good regional balance. decent public private as well with 8 private, 6 public.