“The design process of the airplane has matured, flight control systems have evolved, criteria and analysis techniques are available, yet PIO persists.”
Certainly it does but that is because it is pilot induced. It sounds a bit facetious - I am not trying to be so but point out that this is not nowadays a design issue so much as a human issue. There is nothing I can see in the accident which can be attributed to the aircraft. A different approach to training is probably the answer and proper CRM but the design oriented approach will not work in most cases because of the human factor. There will always be someone who finds a way to crash an aircraft in a totally unexpected way. In the end it still comes down to the man at the front.