The question of training is to my opinion the key one.
Is it possible to train a crew so that in case of another failure of the same equipment in the same weather conditions etc. the aircrew would not crash?
If the answer is yes, then the training of the crashed aircraft crew was not adequate.
If the answer is no, or if the answer is that it's not reasonably doable to train crews to get out of any kind of failure that might happen, then either you accept that public air transportation safety cannot be improved, or you do something.
Amongst the things that might be done, maybe
-initial training of pilots (verbal reasoning etc.) , the EASA ATPL written exam does not require any sort of reasoning ability.
-dialog between the computer and the crew, for instance, if the angle of attack values are discrepant from one sensor to another, show the raw data to the crew instead of letting the computer decide on his own that the bad ones are good without telling the crew; (cf canet plage accident), if a stall is reported by the computer, show the raw data used by the computer to draw that conclusion (angle of attack values, etc.).