Wake me when the streaming market crash
Seriously, when the users feel it's a bargain and you don't lost money, either the suppliers(in this case: labels) or your investors lost.
The traditional streaming model is: you can't control what's playing (unless you are the DJ), and all you can do is changing stations, or tolerate a song or two.
I get the model "you are the sponsor, you don't need to listen to yourself", what I don't get is Spotify.
Spotify is basically the music version of Netflix.
But what they are extremely undercharged: Netflix charge $8/month, about ½ of buying a HD movie.
Spotify cover at least 100 times amount of songs (average user could watch about 5-10 movie, but playing 500-1000 songs/month is average amount people expect), so they should charge at least $50 to cover the cost (½ of 100 songs, each play 10 times)
But due to a loophole in the DOJ antitrust settlement, Spotify only need to pay the same amount radio station does, while giving end-user the choice to play whatever they want like Netflix.
Sooner or later, music labels will notice they actually loosing money using this model (I remember someone CEO did), and lobby the government to force all digital streaming service pay an highly-rised royalties.
At that time, let's talk about how music fans are continue shift to streaming service.