Yea, that's one of those things - if something was your strength and became your weakness, how that would work. Like if bowling onto the pads of some Indian batsmen started yielding LBWs, I wonder how many bowlers would take the chance of getting clobbered.
I think despite the general riskiness of the shot, and Ponting's waning ability, if I were an opposition captain and Ponting came up to bat, I don't know if I'd tell my bowlers to bowl short. I'd probably start him on spin - regardless of what people say in that other thread, I feel Ponting is real weak against spin early in his innings. Maybe from both ends if I had two spinners. If not, then I think just standard outside off stump would be more productive. I probably wouldn't take the chance of bowling too many short ones. Sometimes targetting something like that can have the opposite effect, and if you bowl bad short deliveries, or he happens to hit couple good shots - which happen to be his favorite - it can just help him get his eye in and give him confidence. And once a batsman of that quality gets his eye in, and is feeling confident, generally you're in trouble.