That's probably true. I expect the general ability to think and reason will as well. We do so now because it was a survival skill in the past, but even today those who have the most children are the least able to afford it. Society makes up the difference. The result is more general ignorance because the need to think is less important, the ability to accomplish is irrelevant to breeding, which in the Darwinian sense "WIN!"
One day I expect we will have AI's or at least highly advanced expert systems and the need to understand will be completely obsolete. Certainly there will be those who wish to learn, but the means of human interaction to make it so will deteriorate and no machine will replace human interaction, the University of Phoenix notwithstanding.
All needs will be provided for. There will be no motivation, the population can be controlled by software. No war, no ambition, no need to strive. All evolutionary imperatives erased. Nature does not keep what it does not need and our minds will degenerate. We'll be free from want, from adversity, from wonder, from principles. We'll become the Eloy, but without a hope of redemption or resurrection. Indeed the concepts will be beyond our understanding. The question is whether at some point the machines become the Morelocks. At that point I don't see a reason they shouldn't just discard us.