"In my view following such airspeed anomalies it would be better for the 'system' not to disengage but to degrade to a basic attitude and thrust hold mode accompanied by a pretty serious warning about what was going on."
Whether is is medical or aeronautical, automated systems (patient ventilators for example) should degrade gracefully, sustaining basic functions rather than just cutting out. The greater reliance on automation the more graceful the degradation needs to be rather than dumping the surprised operator directly into a manual/raw data situation.