bearfoil, I have a favorite homily about foolproofing. "No matter how well you foolproof a system God will provide you a better fool." (Some idiot is going to put his hand in the toaster.) Fixing the pitots by getting better pitots is simply going to lead to the discovery of even more obscure means for the pitots to fail transiently or permanently.
So you must presume they are going to fail. Then you look at the next step in the over-all failure chain and see if you can at least partially mitigate it. You recurse as far as you can into this process.
Please don't advocate simply changing the pitot tubes as the grand solution. It is very obvious there were several serious failures in the chain of events that led AF447 with 228 people aboard to a watery grave. ALL of these items should be addressed and mitigated as much as feasible. (And I am sure that mitigation process will include some brutal cost calculations. These companies are in business to make money. We, the people, should demand these calculations be made public - for ALL airlines and aircraft companies. Then we can make our decisions about flying or not, which airline, and how often. I suspect the pilots would like to know their personal risks, too. And with the A330 line it seems that risk is uncommonly low already.)