As far as football and football only is concerned, the Sun Belt's moves seem obvious and inevitable. There are nine football members, and Texas State, South Alabama, and Georgia State have already started their tasks of moving up to FBS. The Sun Belt already has South Alabama; there is no reason they won't invite Texas State and Georgia State. That's 12. I also see no reason why the SBC wouldn't expand further; as other schools like Georgia Southern, Appalachian State, Lamar, Sam Houston State, Texas-San Antonio, and others who are considering the move up, move up, they will likely get the same invite.
46566, you're right; the Sun Belt could use another bowl deal, but I don't see it happening until it expands significantly. The conference knows its place as the third-tier southern conference, so it likely will welcome literally any third-tier southern football school.
true they could always try and get the st pertersburg bowl or papa johns bowl in alabama. With south alabama joining the conferance it would help the sun belt with it's pressance in alabama. both are low tier bowls that seem to be low on the pecking order for most conferance. the sun belt will have teams in both states. This will bring more money to the conferance and give it stablity mainly because going to a bigger conferance gives them more money from bowls and hopefully schools don't need as many money games to servie as they do now.