It's easy to say swing the axe when the ashes are lost. This isn't a bad team, just a team playing badly. It's quite possible that Ponting, Clarke and Johnson could hit form next test and all is forgotten. Clarke is clearly out of form though, Ponting is in his twilight, still probably the best option though, especially since Clarke probably isn't quite ready to be captain just yet. As good an idea as using Katich, Hussey or Haddin is short term as has been mentioned, it's probably not the best idea.