Re-reading The Engineer of Human Souls by Josef Skvorecky (marvellous book), I came across this passage in a letter to the protagonist:
At that time you were interested in palaeontology and you had discovered the hypothesis of someone called Dollo – I think you called it overspecialization. It dealt with the mystery of extinction. Dollo, as far as I can recall, claimed you could paradoxically explain the dying out of some species by a too successful struggle for the surÂvival of the fittest. It seems that some animals underwent a rapid development of certain anatomical features that seemed at first to give them an advantage: herbivorous reptiles grew to such a size that smaller carnivores could not harm them. The sabre-toothed tigers developed huge tusks which could pierce even the skin of a dinotherium. But sometimes things go awry and the development of advantaÂgeous features doesn’t cease at the point of greatest advantage. The brontosaurus keeps on growing, the sabre-toothed tiger’s tusks get longer. This growth continues ad absurdum until, according to Dollo, “there appear animals which are no longer adapted to survival, and these die out.” The four-metre sabre-tooth’s tusks curl round and close its jaws so that in the end it can only feed on mice. The brontosaurus reaches gigantic proportions and its brain, which is the same size as a cat’s, can no longer manage the huge body; another brain develops in the pelvic region, but the two never manage to get coordiÂnated and the brontosauri die out as a result of anatomical schizoÂphrenia.
Thus far Dollo. You, ever the cynic, applied this to mankind. In the struggle for survival man’s brain has grown, giving him an undisputed advantage, but once again this growth has not stopped at the point of maximum advantage. His rational abilities have grown, while his emotional and volitional capacities have remained unchanged. Thanks to this hypertrophy of the rational part of the brain, reality has become more and more complicated, leading to increasingly irresolvÂable conflicts of the reason with the emotions and the will, in turn proÂducing individuals incapable of action – which can only be the product of the instrumental, not the reflective intelligence. Such individuals are no longer able to deal with life. Their numbers are increasing. Today there are already whole classes, or more precisely, whole strata of them. And when this overspecialization overtakes all mankind, Homo sapiens will die out.
I know you didn’t mean it entirely seriously, Dan, but perhaps you happened on the trail of a disease that Marx and Engels were clearly aware of too. Fortunately all of mankind hasn’t yet been afflicted -only intellectuals like us.