I do love Spotify as a product, however I don't think it will scale the same way Netflix does. Spotify is at the mercy of major record labels, and as their books become more transparent the record labels will squeeze every dollar they can for licensing. That is, unless they find a way to upend the record industry entirely. Spotify has a unique position with their amazing discovery/recommendations engine- they could p…
Starting their own label is exactly what they need to do to remain competitive. It's exactly what Netflix ended up doing and I think it's turning out pretty well for them. I wouldn't be surprised if Spotify tried poaching higher-level strategy people from Netflix.
If like me you like composing playlists instead of playing one full album at a time then not having the vast majority of your music available on a single service is a huge deal breaker. When I hear a song out there and I want to add it to my playlist I expect that it will be available on Spotify and the vast majority of the time I'm right.
If I need to go hunt for songs on various services and I can't easily make a single unified playlist with all of it I think it'll be back to piracy for me, it won't be less convenient and it'll be much cheaper.