"the world will not end"
"So if we're going to move to a world where that is not possible any more then the world will not end, but it'll be a different world." -- James Comey
So he knows that the world will not end. And he also bloody well knows that first, the FBI is at fault for this problem, and secondly that very probably there's nothing on the device regarding terrorism. Did the Paris shooters use any encrypted technology? No, it was all normal messages.
No, the world will not end. And it will be the same world.