Thats after his comeback when he was actually a world class batsman for 2 years. He WAS dropped after getting a slow century in Zimbabwe.Nah he announced his retirement at the start of an aussie test series and made sure that he could extend his career by 4 tests no matter what. Went out on his own terms, wasn't dropped afaic.
And this applies to every nation, albeit to very slightly lesser degree... FFS Ponting wasnt dropped even though he was absolutely tripe for the major part of 4 years since 2007. It is difficult to drop legends of the game, and arguably they should be given more chances to come back into form than lesser mortals.