So, single pilot operations are coming, we are told by Greenlights. Couple of examples, SFO-HKG, winter time, block time 15.05hrs, how will this single pilot get six hours rest? If the WX is at all 'iffy' around HKG he will need his wits about him, same if it is, for example, a SIN-LHR sector in winter, not easy if you have been awake for 17-18 hours. OK, once in the cruise, does the pilots bed become a flat bed for sleeping? Does he blissfully drift off into slumber awaiting a routine wake up call, with the possibility that a developing abnormal situation may sound off an alarm at any time that keeps him monitoring for the rest of the flight? What provision is there should the pilot become incapacitated? Personally I don't think single pilot operation has any better chance of ever becoming reality than a no pilot situation does.
Mach - No matter how sophisticated the system or how deep the bunker, brute strength, ignorance, unlimited numbers and a suicidal mentality that is still in the fifth century AD will be able to overcome it, particularly in third world countries where there may be some sympathy for the terrorists and bribery and intimidation are the norm.