I think that you are underestimating the efficiency of intersystem communication in a world where a lot of organizational communication is handled through information technology.
Speech and reading seem to be at most 60 bits per second. A single neuron is faster than that.
Compare to the human brain. The optic nerve transmits 10 million bits per second and I'd expect interconnections between brain areas to generally fall within a few orders of magnitude.
I'd call five orders of magnitude a serious bottleneck and don't really see how it could be significantly improved without cutting humans out of the loop. That's what your data mining example does, but it's only as good as the algorithms behind it. And when those approach human level we get AI.
I don't understand your point about specialization. Can you elaborate?
Individual humans have ridiculous amounts of overlap in skills and abilities. Basic levels of housekeeping, social skills etc. are pretty much assumed. A lot of that is necessary given our social instincts and organizational structures: a savant may outperform anyone in a specific field, but good luck integrating them in an organization.
I'm not sure how much specialization can be improved with baseline humans, but relaxing the constraint that everyone should be able to function independently in the wider society might help. Also, focused training from a young age could be useful in creating genius-level specialists, but that takes time.
Also, I don't understand what the difference between a 'superintelligence' and a 'sped-up human' would be that would be pertinent to the argument.
Given a large enough speedup and indefinite lifespan, pretty much none. The analogy may have been poorly chosen.
Wait...one sec. Isn't all that redundancy in human society a good thing, from the perspective of saving it from existential risk?
If I were an AI, wouldn't one of the first things I do be to create a lot of redundant subsystems loosely coordinating in some way, so that if have of me is destroyed, the rest lives on?
If I understand the Singularitarian argument espoused by many members of this community (eg. Muehlhauser and Salamon), it goes something like this:
I'm in danger of getting into politics. Since I understand that political arguments are not welcome here, I will refer to these potentially unfriendly human intelligences broadly as organizations.
Smart organizations
By "organization" I mean something commonplace, with a twist. It's commonplace because I'm talking about a bunch of people coordinated somehow. The twist is that I want to include the information technology infrastructure used by that bunch of people within the extension of "organization".
Do organizations have intelligence? I think so. Here's some of the reasons why:
I talked with Mr. Muehlhauser about this specifically. I gather that at least at the time he thought human organizations should not be counted as intelligences (or at least as intelligences with the potential to become superintelligences) because they are not as versatile as human beings.
...and then...
I think that Muehlhauser is slightly mistaken on a few subtle but important points. I'm going to assert my position on them without much argument because I think they are fairly sensible, but if any reader disagrees I will try to defend them in the comments.
Mean organizations
* My preferred standard of rationality is communicative rationality, a Habermasian ideal of a rationality aimed at consensus through principled communication. As a consequence, when I believe a position to be rational, I believe that it is possible and desirable to convince other rational agents of it.