This is a fascinating and worthy subject; there are some links in your reasoning that I would like a more rigorous explanation of.
jump over low memetic fitness regions of the memetic fitness landscape and discover higher fitness technologies on the other side rather than leveling off at the 'golden age' level of Minoan Crete [or] the Abbasid and other advanced Caliphates
So, two questions here:
What does it mean to 'level off' at a golden age rather than leap over a valley? I feel like there must be more than two dimensions here, and I'm having trouble visualizing your mixed metaphor.
What are the relevant feature(s) that Minoan Crete holds in common with the Abbasid Caliphate? Do these two cultures really belong to a discrete area of culture-space? Why?
as civilizations reach a higher level of development, more effort is available for indoctrination
Sorry, what? Who is indoctrinating whom? With which resources? Why do we think these resources are disproportionately available in more-developed civilizations? Which avenues of development promote this kind of indoctrination? Might other avenues of development counteract the indoctrination? Do we have any reason to expect those other avenues to develop more slowly or less effectively?
Ultimately, the civilization systematically destroys the ability of its unreasonable men to compete for the slots in the society where rationality is required
Systematically? Really? Are there people affirmatively trying to wreak this sort of destruction, or does civilization just naturally destroy the political competitiveness of unreasonable people at such a uniform, high level as to have systematic effect?
Also, which slots in society require disproportionate amounts of rationality? Obviously, some jobs are more important than others, and some jobs carry so little autonomy that rationality is difficult to exploit, but wouldn't rationality be more or less equally useful as a fraction of the usefulness of the job in, e.g., real estate sales, a pediatrician's office, the US Senate, a police captain's desk, and the purchasing division of a global hotel chain?
There seems to be a general stage where civilizations have widespread trade networks, highly varied luxury goods, sometimes running water and/or printing, complex mechanical toys, large cities etc. The more ancient civilizations at this rough stage always have less advanced metal-working and animal&plant domestication than the later ones, as metal and genes advance relatively continuously.
More advanced civilizations have more wealth per-capita, though not more median wealth. Much of that excess wealth is used for more religion, which includes educat...
Katja's recent post on cryonics elicited this comment from Steven Kaas,
"If cryonics is super-far and altruism is seen as more important in far mode, why isn’t buying cryonics for others seen as especially praiseworthy? Your list of ways in which cryo is far-mode seems too much of a coincidence unless cryo was somehow optimized for distance."
...a comment which finally caused the following hypothesis to click into sharp resolution for me.
My guess is that it's cryonics advocates who are optimized for distance. Most people are basically natives of near mode, using far mode only casually and occasionally for signaling, and never reasoning about its contents. Even those who reason about its contents usually do so and then ignore their reasoning, acting on near mode motivations and against their explicit beliefs. Children, however, actually need to use far mode to guide their actions because they lack the rich tacit knowledge that makes near mode functional.
Some people get stuck in a child-like behavioral pattern, probably due to a mix of neurological bugs which prevent near-mode from gelling (aspergers and schizotype) and internalization of explicit (far mode) rules condemning near-mode (obsessive compulsive personality disorder). They become Shaw's "unreasonable men" and push for the universal endorsement of far-mode ideas. Since other adults don't care about the contents of far mode much anyway except to avoid being condemned for saying the wrong things, others go along with this, and there's a long-term drift towards explicit societal endorsement of altruistic norms with an expanded circle. This does matter, in the long run, because such norms provide convenient nuclei for the emergence of forms of mostly-arbitrary identity markers.
Unreasonable men also develop artificial ways of reasoning, methods of rationality, which work even when the minds innate tendencies towards reason aren't engaged by near mode. These methods don't necessarily suffer from the bugs that near-mode reasoning suffers from. Once the right set of methods, most importantly math, science, nation-states, cosmopolitan liberalism (actions permitted by default rather than banned by default) and capitalism, are developed, they enable scientific and technological evolution to jump over low memetic fitness regions of the memetic fitness landscape and discover higher fitness technologies on the other side rather than leveling off at the 'golden age' level of Hellenistic Greece, Tang and Song China, the Roman late republic and empire, the Abbasid and other advanced Caliphates, Minoan Crete and probably many other pre-industrial civilizations.
Unfortunately, as civilizations reach a higher level of development, more effort is available for indoctrination, and the indoctrination methods are based on the introspection and intuitions of these 'unreasonable men', and are thus ineffective on normal people, who simply snap out of their indoctrination when they become adults. As the unreasonable men become further indoctrinated, they become less able to make effective use of near-mode reasoning, which their morality condemns, but the methods that make far-mode reasoning rational don't make it an adequate substitute for near-mode when dealing with situations where subtlety, competition or energy are required. Ultimately, the civilization systematically destroys the ability of its unreasonable men to compete for the slots in the society where rationality is required to maintain the society's energy and the society looses the ability to respond coherently to threats and collpases.
Cryonics is a canary in the coal mine. At a certain stage of collapse, there has to be some idea that is transparently correct when one uses valid reasoning to analyze it but which is roundly rejected by everyone with near mode and is only accessible to people in extreme far mode. Once the far mode people are too ineffective to promote their ideas to the status of even verbal endorsement by the general population this idea will never rise to prominence.
I'd love to see your thoughts.