Let's just hope AI's will be smarter than these researchers
"Our basic biological machinery in humans doesn't change; it's the same 100 billion neurons housed in a few pounds of cheesy matter. It could well turn out that once you achieve a human level of machine intelligence then it's not much harder to go beyond that to super intelligence."
No logic there. The very fact that human intelligence doesn't seem to progress much, not even at scales of thousands or tens of thousands of years, and that evolution needed billions of years to reach even just human level intelligence, are all a very good indication (if not proof), that the level intelligence can only be raised very slowly and does not scale well.
If an AI will be developed by means of evolutionary processes, then it will be also bound by the limits of those - which are pretty obvious. And if it won't, then it won't be developed using evolutionary processes, then it won't have to develop traits either, that would pose a threat to us. Hell, it wouldn't even necessarily have a motivation to self-preservation, let alone taking over the world.