@Linkat,
Roger... I had this same argument with my 15-year old, who took the position that he could do it. I think that if they start installing controllers on planes with thumb sticks and a green triangle button... maybe a 15-year old could do it (I am thinking about writing the NTSB with this idea). I have never heard of a civilian ever even attempting to land a plane.
Linkat... you really don't need to worry.
First, the great majority of passengers on hijacked planes live to talk about it.
Second, compared to all of the other bad things that happen to airplanes (like pilot error, mechanical failure or bad weather) hijackings are pretty rare.