This last part I can hardly agree with. What is smartness? And, which is more important, is there a way to become smarter? You say that machines will be smarter than humans with each generation, but why you deprive humans of the same quality, i.e. being able to become smarter?
Our hardware (and firmware) evolves much much slower than machine hardware. We are not re-engineered totally. Machines are.
The evolutionary algorithm is fascinating because it starts out with dead matter and is blind. But it is not very efficient. Once there is sufficient intelligence to DESIGN stuff on purpose, improving intelligent hardware by design is a much more efficient algorithm than the evolutionary algorithm by random change and survival of the fittest.
Moreover, especially with software, the generations can follow up eachother much quicker. If software starts to rewrite itself, you might have a new version (a new generation) each day for instance !
Your statement holds true only in one case, that is, when the level of smartness is tightly fixed. If it is not (and obviously it is not), then your statement is false. You start being undersmart in an effort to understand what you don't understand (a smarter entity than yourself), and in the process you become smarter than that entity.
We are bound by our own hardware (our bodies and human brain). Machines aren't.
Of course, we can "help" our selves with machines... up to the point where again, we don't control them any more.
Bitcoin is a perfect example. Imagine that machines found out how humans would react upon a cryptocurrency, and that they simulated that this helps them in gaining power. Imagine that machines found out that the real power in the world resides in the control of financial assets, and that their problem is that they don't know how to take the power of central banks. So they invent a "computer money" that people will start to use, and that will eventually overthrow central banks.
How would machines do that ? How would they trick people into stepping in to their system ? Imagine that these machines have some cracks of certain cryptographic systems, but didn't reveal so. Wouldn't a mysterious founder of the new currency be a great way of introducing it, without giving away that it was just a "machine trick" ?
(don't get me wrong, I don't believe bitcoin has been invented by a conspiracy of machines wanting to take over the world ; but you see how a very smart machine might trick people into acting how it wants, without giving its identity free).