Well after Monday, I don't think anyone will ever try to bounce him out again.
I actually think that there's a low-risk way of trying to get him out - there's always a chance, if you bowl off-stump, that he's going to score heavily if he gets it right or you get it wrong. However, I think Glenn McGrath actually spotted a weakness in him which the Australians didn't continue to exploit - in the second innings at Old Trafford, McGrath came around the wicket first ball to KP and got him lbw with a yorker. I think the fact that he tends, early on in his innings, to play around his front pad a little too much makes him vulnerable to this - his leg-side play is so strong it doesn't work that well from over the wicket, but I get the feeling around the wicket it may be successful, partly because of the little shift to the off-side he has during the bowler's delivery stride. Having said that, unless any international captains try that rather unorthodox route again, we'll never find out.