Umm...SFA is the good mid-major job and BU is not going to leave for a Tulane, Marshall, etc. He already turned down more money in Marshall and Southern Mississippi two seasons ago.
No, it will take a power 5 conference for him to leave.
Remember Robert Hill (SFA AD) gave BU his first division one head coaching gig and BU is very grateful for that and BU is going to want to go to another program that is just as committed to winning as SFA is.