Is there a good science fiction story where humanity discovers it’s unalterably getting dumber? As in within a fixed number of generations tool use will cease?
It's a major plot point in one of the books in the Bobiverse series, though it's a civilisation humanity meets instead of humanity itself (not saying anything more to avoid spoilers).
In Adrian Tchaikovsky's "Children Of Time", there's a generation ship wandering space that's a marvel of human engineering, whose inhabitants are getting dumber every generation and losing the capacity to maintain or even respect the incredible environment into which they were born. Certainly rings a bell.
Aurora by Kim Stanley Robinson. A multigenerational ship's population is losing its ability to maintain the complex mechanisms needed to keep everything functioning.
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(You could argue that "The Time Machine" was the original example.)
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