Human Beings developed big brains because they bestow a tremendous problem-solving advantage. This is what technology is. Railing against technology amounts to a rejection of essential humanity - which is absurd because only a human could ever make such a judgment and he/she would do so only in attempting to solve a problem!
The whole multi-million-year evolutionary story of hominids has been about the adoption of ever more sophisticated technologies and the accretion of greater degrees of biological IQ. This ancient trend shows an exponential pattern of increase - so slow as to be unnoticeable at first but irresistibly approaching the near-vertical. We are probably sitting right on the elbow of the great curve right now.
Big brains aren't going to go away. They are only going to get "bigger" - very rapidly over the next few decades in all likelihood. This is because achieving greater intelligence is the most valuable thing in the universe. It is the great project of human beings. Without intelligence, there would be no such thing as "value" to begin with. With intelligence, the idea and utilility of "value" expands commensurately.
Getting people to voluntarily limit intelligence (when it can potentially be grasped) is as misguided as trying to get people to act altruistically all the time. And right now, greater intelligence CAN be grasped.
When the likes of NASA and Google are interested in the idea of the Singularity, it's becoming more an accepted, realistic mainstream expectation. The advent of machine consciousness -- with machines designing the next-generation of machines, which, in-turn design the next generation, etc., etc. -- means that a whole new level of Life On Earth will be coming into existence. This "birthing" process probably won't happen in an instant -- it will probably occur over a span of 5 - 10 decades. Still, most of us alive now will probably have a normal conversation with a computer one day not too long from now.
Whenever Singularitarians have been presented with the idea of a human die-off, they shrug. Such a thing would have absolutely no effect upon the general exponential trend towards The Singularity. they say. It will just mean the end of the multi-billion human-dominated, mass consumer society. "So what?"
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Singularity University Presentation