This idea, just like locked doors, fighter escorts etc. etc. has nothing to do with preserving the life of those onboard and everything to do with saving the lives of those on the ground. If the system was ever installed the authorities won't give a monkeys if it can read a notam, decide if it's got enough fuel or do a go-around, all they want is for the aircraft not to fly into a crowded city centre. A safe and assured landing for the aircraft and passengers would be a bonus but if it spears in somewhere away from a large population centre it would still have achieved it's objective. Scary stuff, hopefully will be retired before this becomes reality.