Let's consider the vested interests involved... if this is a "nutty pilot commits suicide" story, the cost will be born by airline training and line management departments. If it's a "loony fundos steal plane and screw up" story, the cost will be carried by security and intelligence departments and communities. (ie in both these cases, ultimately by us, the travelling public).
If, however, there was (another) 777 electronics bay fire - remember Egyptair on the ground at Cairo a couple of years ago - it will be Boeing that carries the can. And after the 787
PR fiasco, I wonder if Boeing can survive if their cash-cow 777 turns out to be prone to spontaneous in-flight ignition...
Check the Boeing share price ticker for the past couple of weeks. Big drop 12 days ago when MH370 disappeared. Back up again when the suicidal pilot/loony fundo theories took hold. Starting to drop away again now....
Follow the money, as always.