I think the problem between the past when the schools went into divisions in the old days before the split and today was the cost of sports including travel was much cheaper than they are today. That is why you are starting to see more schools moving up into FBS, FCS and D1 over all is an idea that should be looked at.
UC-San Diego would be an extra game in D1 with San Diego State and U. of San Diego. Gives an extra school in the home city and could cost travel cost down. Same thing with Bellarmine with Louisville. Dixie State adds another D1 close to home for the other D1 Utah schools. Merrimack adds another D1 school in the northeast.
Now, if the AAC wanted to help the overall conference to ease of cost on all parties? The east do have the worst travel expense being scattered around.
Delaware, Buffalo, Stony Brook, Dayton, VCU, UMass., Vermont, Richmond, ODU, Marshall, Western Kentucky, Middle Tennessee State, Appalachian State, UAB, College of Charleston, Georgia Southern, Southern Mississippi, Toledo, Ohio U., Chattanooga and Troy all would be excellent addition to the AAC to help ease the cost of spending. Even James Madison could have help. Being a far flung conference do add more to the spending on all the sports for the schools to spend on.