Caygil asked: "Would it be out of question to create an automation graceful degradation, which:.."
There is a patent filed, since the accident, on just this idea.
The more I think about it the more I suspect that the plane could fly perfectly well using only GPS and inertial data if it's looking to maintain altitude, attitude, and speed. Abnormal conditions would be indicated by the precursor conditions to either stall or mach buffet. Actual stall would be indicated by altitude loss. So for modest periods of time the plane could probably do very well on such data as it has. I'm not sure retrofitting this "learning" software into the ancient (in computer years) computers aboard an A330. But it certainly could be incorporated into new designs.