I agree with most of your comment except Idiocracy - while sometimes funny it is a trite classist argument, already made in various form centuries ago ("the poor are inferior and reproduce quickly, ergo each generation will be lesser than the previous").
While in reality e.g. IQ score baselines keep getting adjusted to account for the fact that kids keep getting better and better scores as time goes on[0].
The world is not getting dumber and if it is there is no evidence for it and plenty against it.
[0] https://ourworldindata.org/intelligence
