How much slack does Barnes have?

With the news of Texas' leading scorer Sheldon McClellan transferring two days ago, we wonder about Rick Barnes' job security in Austin. Peter Bean at Burnt Orange Nation wrote a good article about why the transfer is a disconcerting sign for Rick Barnes' future. McClellan is the third transfer in two years (Jaylen Bond and Sterling Gibbs are the others) and the Longhorns finally missed the NCAA tournament, ending Barnes' exceptional 14-year streak of making the tourney.