In recent years artists like Drake have started their own labels and collaborated directly with tour organizers to generate different sources of income and cut out middlemen. While it's difficult to imagine Spotify generating hit music at the same pace as Netflix produces hit shows, there is nothing stopping them from becoming a tour organizer or bringing artists to perform at their own show (hint: iTunes festival).
If they are really serious about the long term they would be developing new ways to experience "live" music. Perhaps VR concerts and performances or features that let the audience send feedback to the artists.
The good news is that they have shown they are not afraid of trying new things (ex: Video player within the playlist and the RapGenius tie ins).
Time will tell but I am bullish on Spotify changing how we listen to music for the better because the industry is ripe for a new disruption (Records -> CDs -> Digital -> ???)
[1] - https://www.digitalmusicnews.com/2016/05/26/band-1-million-s...