The article includes some figures that hint at the possibility that people may not be listening to music as much as they once did, not just that sales and profits are lower because of changes in the way people acquire the music they like. If everyone who had bought albums in the past and played them over and over were switching to streaming, one would expect a huge increase in streams. For years the driver of the popular music monster was adolescent social networking in which actual physical contact with other kids, in which listening to and dancing to music played a significant role. The creepy little nerds who listened to stuff that didn't make the top 40, by themselves in their rooms were pretty much irrelevant to the major market.
My impression is that solo listening is becoming more common, to the detriment of the social contagion that used to push pop hits to the top. Video games have their own sound track, and web based social networking does not require music to function. Of course the percentage of the population under twenty has been falling for years. And the limited playlist local radio stations that used to tell kids what was hot are having a worse time than the record industry.
Much of the music that is selling seems to be going to an older audience. The big sellers in the article are pretty mature performers and songs. Adele is hardly likely to inspire the bubble gum set. As the children of the pop music juggernaut age out, we are seeing a lot of older performers making the larger sales as the sales as a whole are shrinking. That nostalgia market may be why people are buying boutique vinyl releases.
If the demand for music as a whole is dropping, and the plays are being scattered across many more different releases than in the past due to the open door to distribution via the web, the value of any particular release will fall. The days of the mega-hit uberwealthy superstar may be over. Many of the most successful of recent performers are putting out theater as much as song, and, like sports figures, making as much from endorsements and branding as they do from music.