After the Germanwings disaster[0] and the near miss here, I wonder if it is time to re-evaluate the reinforced cockpit doors. Basically, every single passenger on an airplane knows that if someone is trying to attack the doors or otherwise hijack the plane, you have to stop them no matter what. Even if the hijackers have guns or knives, you still have a better chance trying to fight them.
On the other hand, a single pilot behind a reinforced cockpit door can bring down the entire aircraft.