Considering more and more aircraft is fly by wire and most pilots get their "air time" in sims, is there not a advantage in building a mock cockpit at the back of the airline with a backup pilot to take over when other protocols are met?

All this is doing is highlighting how one person beit the president or prime minister of a country, judge's, GP's, practically anyone including a pilot can steal some or all of other people's lives to one degree or another.

Edit. Where I am going with this, is the Space Shuttle had 4 control systems and majority rule or agreement of the 4 control systems made things happen. I dont think more than 2 cockpits would necessary.

Another left field idea, is the cock pit doors could be engineered so that if enough people all pulled on a rope firmly attached to the cock pit door like a tug of war, in order to gain access to the cockpit, then maybe the passengers have a chance. However this relies on the passengers not being deceived by the pilot which is also what is troubling the air line industry and so called psychologists. When you can work out when you are going to lose your temper in the future, let the psychologists know, they might be able to study it....