I like the idea of replacing a Sun Belt team and then hook-n-laddering App State up into the conference you want to play in. This means you're knocking one of the weakest teams out, and slightly strengthening each conference.
I don't however necessarily like the idea of moving App. State all the way up straight into the ACC.
I mean, hey, it's your game, so do whatever you want. I just find it extremely unrealistic and silly for an FCS team to move straight into a BCS conference.
Then again...it's only the ACC...