The issues that need to be considered reg. Ponting are:
1. Is he the best captaincy material in your best XI ?
2. Is he part of your best XI?
3. Is he better off playing without the pressue of captaincy to get back something of his awesome touch of the old?
4. Is it better if he simply moved down the order and skippered from 5 or so?
For me, I think Ponting still deserves his place in the side as a batsman. And I think it is the wrong time to be changing captains anyway. What B_W said about changing captains at the end of a season or at least significant series makes sense. I would let him captain till the WC and then take a call on his future after that. If I were an Aussie selector, I would have a word wtih him and go "look mate, we trust you and your skill and your experience. So there ya go, you are skipper till the WC. All the best."
But one thing I would do is look at him moving down the order, esp. if he continues to flounder from 3 against India. That line up of Hughes, Katich, Watson, Clarke, Ponting, Hussey looks sooo much better, at least on paper and probably current form and balance. That said, Ponting could well fill his boots against INdia (esp if they win toss and bat first against this attack) and may end up batting 3 again in the Ashes and who knows, it might just end up being a blessing in disguise for England.