Seniortarget - agreed but it is a question of probabilities.
It is highly likely (though not certain) that this guy committed an act that is a possible (though highly improbable) act on any flight we might take.
Personally I think the risk of a pilot suicide/ pilot terrorist or whatever we call it while a possibility is despite this incident is still very low indeed.
If we try and introduce procedures for every possible risk however low then we will get to the point where inconvenience is overwhelming.
When I fly I am thousands of times more likely to be killed by the mistake of a well intention ed and concientious professional pilot than I am by a mad man. But I still fly because the risk is so small. Way smaller than the risk of the journey to the airport for example.
I know 2 on the flight deck can help mitigate this risk I am not sure that i personally would bother.
Obviously not my decision though - just a personal view