If that many schools are going to be listed as possible replacements, I think a few more need to be listed. It seems like an exercise in exploring the choices, then more probably need to be included.
Also, ULL, as they are also in a mid-major market of Lafayette which has about 350,000. That's a better market than Western Kentucky. Tulane is far enough away not to take in the Lafayette and South Central LA market. One only needs to look at the attendance of Tulane games when they played at ULL and La Tech's fields.
Metro, I had completely forgotten ULL, who I just refer to as "Louisiana." They actually like being referred to as just plain "Louisiana," as opposed to UL-Lafayette. Louisiana has some decent facilities (not great, but decent), and the Lafayette market is certainly nothing to sneeze at. If Rice had dropped down to D3 awhile back, I would strongly favor having Louisiana take Rice's place. Since Rice did not drop though, that puts Louisiana in a bit of a bind. Louisiana has ok fan support (better than Louisiana Tech's, but not by much), but it's not enough to seriously warrant an invite should a member from the east division leave.
An eastern orientation would mean you should also not count out these:
Troy: a great performer except last year, and they do have some claim on the Montgomery, AL, Dothan, AL and Mobile, AL markets. UAB is not listed as a linked team in those communities newspapers but Troy is along with Bama and Auburn. Troy is a Southeastern AL/Southern Alabama followed school. Montgomery is 300K and Mobile is 550K and Dothan is 150K. It fits the role of the mid-major school of Southern AL and UAB is that for B'Ham and northern AL, while UA and AU are statewide.
I also wouldn't count out MTSU, and they can claim the Nashville-Davison-Mufreesboro Metro market better than WKU as they mid-major school for that area. Nashville doesn't follow Memphis. Its a separate market that is separated by the Tennessee River on I-40 between Nashville and Memphis. Sure Vandy and UTenn are big here, but its a third team and would be a new market for CUSA.
Somewhat agree on Middle Tennessee Metro, but they have some growing to do, IMO.
For a more northern orientation, then these should also be considered:
Toledo: performance and a shared market of 750,000 for the Toledo MSA
BGSU: Same as UToledo and performance is pretty good as Toledo, slightly below however.
Akron: They won the MAC last year and 750K market shared with Kent
Main problem with these teams is their location. Toledo and BGSU are in close proximity to Detroit, and that's pretty far away from most C-USA teams. Akron's pretty close to Cleveland, and that's also a long distance from most C-USA teams.