That’s fine, you’ll get no argument from me there.
Not really, the dumbing down is the setup, but its clearly satire. Carol and Trevor are at least as stupid as any other character in the movie if not more self-involved, and Trevor is able to maintain full reproduction capability thanks to science!
I read this to mean that people are becoming dumber in this world not because of their condition, but that by being unable to understand the forces that shape their lives they believe themselves in control of their destiny, and technology and market forces only serves to enable putting off making the hard choices (Making money then in vitro for the “smart” couple,; Nothing to aspire to but have sex and the miracle of modern medicine for the “dumb guys”)
Like I said, taking anything here at face value is mistaking satire for self important cleverness.