You are missing an important detail here. Humans are very very smart, the problem is that we all think we are smart. I have heard about this Kurweiler thing for quite a while and have to say he is dead wrong and let me explain why.
Humans are smart because they can optimise. There are two ways to digest information; bitmap style, or vector graphics style. Most humans do learning vector graphics style. It allows us to process huge amounts of information with the cost of inaccuracy. This does not mean we cannot process information bitmap style, and indeed there are humans who do, namely autistic. And I don't mean pseudo autistic, I mean Rainman autistic. There is this artist who can look at any sight and create a photo copy of it on a piece of paper. The cost of bitmap is that other functions are put out of order.
Kurzweil from what I am guessing is thinking this is a hardware issue. I say no it is not a hardware issue for our human brains are optimised to process huge amounts of information. It is a conflict of information issue that causes us to be both smart and stupid at the same time. For if we all reached the same conclusion we as a human race would have died out many eons ago.
When two people see the same information they will more often than not come to different conclusions. This is called stocastics, and it is what causes strife among humans. Some humans think God came in the form of a fat man, others think he came cruxifiyed, and yet another came in a beard and head piece. I am not mocking religion, what I am trying to point out is that we all see the same information, yet we all wage wars on who saw the right image.
Thus when Robots or AI gets as intelligent as humans, the machines are going to be as fucken stupid as human beings. They are going to wage the same wars and think they all have reached the proper conclusion, even though they are all right and wrong at the same time. The real truth to AI has already been distinctly illustrated in a movie that gets rarely quoted... The Matrix! Think hard about the battles and the wars and the thoughts. They all represent the absolute truths that each has seen and deemed to be correct. YET they are slightly different.
I will grant Kurweiler one thing the machines will have more storage capacity, but then I ask what is there stopping us from not becoming part machine part human? I say nothing...