Just a quick question from an interested bugsmasher pilot (no real experience of high altitude flight dynamics)
We know that pitch + power = performance.... and lots of talk here about how that could potentially been the answer here. However, if the aircraft has reached a stalled condition at altitude, is some action required to break the stall ie: nose down, power/idle etc. before going to the known power/pitch? If you have unreliable airspeed, how would you know that you're not stalled any longer and could engage the known power/pitch?
Just my own commentary - if Airbus want the aircraft to be fully protected by the computers, they need to make sure that it's very difficult to reach that non-protected state. It certainly seems that having three pitots of the same type and basic design with similar failure modes looks like a single failure mode that can lead to that non-protected FBW state.