I think it may have more to do with education and literacy in general.
As the public schools continue to lower their academic standards and substitute political correctness and self-esteem for critical reasoning and the search for truth and beauty, then literature, science and art will suffer.
Aristotle described Art as 'that which could be', but the current generation of students are being spoon-fed a steady diet of doom and gloom. It's no wonder this outlook should infect the music they create. The dystopia found in much of the contemporary Literature and Art is the result of their poor education.
The comic book super hero that has to rely on super-natural (impossible) means of overcoming obstacles, or the witches and wizards that tap the occult to obtain their power over others, illustrates the problem facing literature and art.
The true heroic courage of man has been abandoned in favor of absurd fantasy. The knight errant is forgotten or ridiculed in the modern arts.
Creating impossible fictional heroes will ultimately just create another new generation of cynics and nihilists.
As for music specifically; creating a melody is much more difficult to do than strumming a few cords ad infinitum, or repeating a moronic beat.
Irving Berlin, Cole Porter, George and Ira Gershwin et al created beautiful melodies and lyrics that speak to both truth and beauty, as do Lennon and McCartney, Bob Dylan, Simon and Garfunkel or Townes Van Zandt.
There's good music being produced today, but young female singers that flaunt raunchy sexuality and dysfunctional behavior suck most of the oxygen out of the room. Bed wetters like Justin Bieber and Ed Sheeran don't contribute much of value either.
When contemporary songwriters are asked who influenced them they invariably name artists from previous generations. It's scary to think that future generations will imitate the likes of a Bieber or a Sheeran.
As we dumb-down our kids, so they dumb down the culture, including music.
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