The WAC had FBS football up until 2012, at one point being the home of teams like Arizona, Arizona State, BYU, New Mexico, Utah, Boise State, etc. By 2012, all of those and more had left, and the WAC was left as a scattering of mostly western US schools (plus Chicago State) playing non-football sports.“Hearing that the WAC's official additions of Southern Utah, Sam Houston State, Lamar, Abilene Christian and Stephen F Austin will be finalized in the next two-ish weeks.“
With the addition of new FCS teams Dixie State and Tarleton State, they're looking at sponsoring FCS football. Adding in the above rumored schools would give it 7 FCS teams.
It's rumored that the existing Southland schools weren't entirely happy with the new additions of Houston Baptist, U of Incarnate Word, and Abilene Christian in 2013. Prior to that wave of additions, the Southland was an entirely public school conference. If the Southland does lose those schools, it will have 6 football playing schools.
There's also been talks about UT-Rio Grande Valley (formed in 2013 from consolidation of UT-Brownsville and UT-Pan American in Edinburg, TX) starting up FCS football. They are currently a non-football WAC member. Also, West Texas A&M (currently D2 football) has been discussing moving up to FCS (they already have the facilities for it).
Assuming the WAC goes forward with adding the above schools, I could easily see them kicking Chicago State to the curb.