There appears to be a assumption, that if the senior pilot had been able to unlock the door, that would have ensured the safety of the crew and passengers.
Therefore if changes are made to enable a pilot to open a deadlocked door, such a tragedy will not reoccur.
I am not sure that the prospect of a violent confrontation on a flight deck between two pilots, as each struggles to take control of a passenger jet, is likely to instil public confidence.
The loss of all those lives including many children and teenagers, to say nothing of the fear they must have experienced in the final minutes of their lives, demands more than mere changes to the security system on the door to the flight deck.