Barring any sudden additions, subtractions, cancelations, or cataclysmic meteor event, the Sun Belt out-of-conference schedule for 2016 appears to be set.
Like it or not, Sun Belt teams are judged more on their performance outside of the conference than inside. For proof, look no farther that the final USA Today 1-128 NCAA Re-Rankings of the 2015 season. The new organization's top rated team wasn't the undefeated conference champion (Arkansas State, ranked 48th) but the winners of bowl games (Georgia Southern, 41st and Appalachian State, 37th).
A-State defeated Appalachian State (who defeated Georgia Southern), yet the Mountaineers' win against Ohio held more value, at least according to USA Today.