One of the main reasons they lost the Ashes was that Gilly never managed to take off. Usually thru out his career he's bailed Aus out coming down the order, this dint happen in the Ashes. If this current Test run continues into the coming Ashes, and Aus dont regain the Ashes, he'll be announcing retirement sooner than we think.
Whats surely worrying about Gilly from the Aus perspective is the manner of his dismissals. In the Ashes, Eng - thanks to Fletcher/Cooley I suspect and the considerable skills of Flintoff - unvield the way to bowl to Gilly. Since then teams are looking to bowl to Gilly from around the stumps, a bit wide, and he duly obliges with a walk back. SA has been employing the same methods.
Maybe Gilly will start to be more patient, but then thats in itself a battle won for the opposition cos he doesn't take the game away from you so quickly anymore.