FAU, FIU, Florida A&M and Maybe Western Kentucky will join the Sunbelt. Idaho is gone, So is North Texas that leaves Denver which could go to the MCC or A Western Conference soon.
The SBC doesn't want to touch FAMU. They will go down in history as having the most poorly planned move up to 1-A in history. They will likely be back down in 1-AA in a couple of years (or they will call the NCAA's bluff and we'll all see the new requirements are a sham). WKU is still four to five years away from a commitment to move up.
UNT is only leaving if they go to C-USA. If the WAC had acted faster and offered UNT/ASU/ULa (pick your combination) immediately after offering USU & NMSU, then UNT would have gone.
Karl Benson waited too long. The SBC schools have had time to crunch numbers and act ... not react. The new WAC's travel budget would eat any SBC school's lunch (other than Idaho). At least with the 'Belt, you are surrounded by teams in your time zone that might actually travel to your games.
The WAC is the Big West II. UNT, ASU & ULa have already been there, done that. We'd rather establish Eastern rivals.
Also, there are already rumors of a new bowl featuring a TBD ACC team and the #2 SBC team, to be played in Miami (SBC has two schools there, plus Miami from the ACC). So, the "SBC only has one bowl game" logic could very quickly be thrown out of the window.