The general feeling is either that, or he's waiting for Mark Richt to retire to a life of philanthropy and ministry so he can take over at his alma mater.
I'm not sure where this idea comes from that Saban's coaching staff at Alabama never changes. Four spots turned over after 2010, and two more turned over after 2011. This year, he's already lost one to FSU.
Yes, it's remarkable that he's been able to keep Smart around, but Smart, the S&C coach, and the running backs coach who you've never heard of are the only coaches from Saban's original Alabama staff still around.