Shaun Marsh's Test Average

Any reason to doubt the return of Shane Watson to the Australian side?  After his excellent 141 on debut at Kandy and a subsequent 81 straight after, Shaun Marsh's form has hit the toilets.  Apart from 44 in his first innings in South Africa (after/during which he suffered a debilitating back injury), his scores have continued to plummet.  With another failure today, it looks increasingly like