The WAC had the chance to add NT,ULL, and ASU alltogether last time and would not do it. They only wanted one more team and reluctuncly settled for Idaho. A decision on the WAC should consider the financial situation of WAC schools (ex.SJSU and FSU), the possibility of Hawaii going indie, etc. As far as WAC expansion, consider that they are more likely to add western schools (ex. Montana, Portland State, etc) for budgetary reasons. With the Louisiana budget crisis I think that it is far more likely that La Tech will leave the WAC than it is that other schools will accomodate them.
Nonetheless, if I ran the WAC I would try to add UNT, ASU, ULL, and TSU (a more compact grouping with LT and NMSU), add a Championship game between division winners at the home of the team with the best record and would break a tie with home average attendance numbers, and try to negotiate the best TV contract that I could.