You may be aware of this, but just to add to your point, the Flynn effect[0] of IQs consistently rising pretty convincingly rebuts the idea that higher SAT scores are _only_ due to the test getting easier.
The argument against the downfall of society stands pretty well on it's own without it though, mostly because there's no evidence the tests are getting easier (regardless of recent score changes a 1600 is still a 1600) and even less evidence the test takes are becoming less accomplished.
http://www.pnas.org/content/pnas/early/2017/01/10/1612113114.
I think it's a bold conclusion to leap from one genetic marker doesn't seem as strongly correlated to education levels among Icelanders to "cognitive genomics is on the decline".
Better to use hyperlinks; order of posts on HN is not immutable.
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