Distribution tends to be the hardest part of any supply chain and it doesn't seem like music is any different. Spotify owns distribution and has almost no competitors anymore (either online or offline) and the future is very clearly streaming. So the labels will end up depending on Spotify for revenue. In 2018, streaming revenue accounted for half of all label revenue[0], and that will only increase.

[0] https://mashable.com/article/major-music-labels-19-million-p...