Having been a youg man in the 80's 90's, but not exactly an old man now (not yet 40), I would say that while its easy to say this is true, people easily forget how bad popular music can be over time......as they only remember the good things.
Comparing what a fool believes by the doobie brothers or you wanna be starting something by Michael Jackson in lyrical quality with Taylor Swift or the latest rianna dance song isn't comparing apples and apples. Why not compare "do the hustle" or some other disco abortion with the Lumineers or an up and coming artist Anderson Paak and that lyricism.
Few people give credit to the present.
That Lauren Hill letter is 3 years old......still no music. I agree with her summation, but......nobody forces you to sign the contract. And still......no music.