Competing with UCF, Cincy, Boise, Houston, Memphis & Navy would be fun
That is an upper tier of teams BYU has never seen in the same conference. It wouldn't be like most "good" G5 leagues of the past that have 2-3 good teams and not much else. And the AAC would actually be pretty deep both at the top and in the middle (Temple, SDSU, SMU, USF, etc are actually decent programs despite being a tier below the other group).