Aire plane accident?

This week on tuesday (24 March of 2015), a big and dramatic accident happened.

One of the aeroplanes of German Wings had an accident in the French Alps. In the Alps at a height of 2000m the aircraft went to 38.000 feet. But when the aeroplane was  cruising the Alps, the pilot went to the bathroom and  when he went back  the co-pilot didn't open the door. The co-pilot didn't want to. It is believed the pilot in the last minutes, tried to open the door with an axe. We think this because they found the black box and listened to the recording. The biggest piece of the plane crash found measure 2 square.
In the aeroplane 150 people were travelling, the majority were catalans and germans.

In the house of the co-pilot Andreas Lubitz they found evidence that he had psychological problems and his ex grilfriend explained to the police:
- One day Andreas said to me: " I will be remembered".

This co-pilot had 600 hours of experience and was 27 years old. I think, that isn't enough to drive a plane alone.
Now, for the security, nobody will be able to stay alone in the cockpit.

But what will happens if the pilot goes to the bathroom when he is cruising over Paris ??