If we are speaking about RW airplane you are totally right. But in my scenario  it is not happening due to  Angle of attack,problem remains with logic map planning to build coding. If you are maintaining level flight and lost of your probe heat, continue to your flight with high power settings. If  stall coding mapped only to airspeed,( That is my opinion, CS can verify the real source of problem) even you push full power, 777 will stall, because stall only connected to airspeed. Frozen probe will not show any airspeed , there fore 777 falls from sky with engines screaming with full power :-/