Even if they get the rights to more music from more labels (and maybe even as a result of that), there will still be a decent amount of independent artists who simply won't put their music on Spotify for multiple good reasons.

I'm not going to demonize Spotify for doing these things, but if their business practices mean that I can't listen to the music that I want, then I have no reason to use their service.

[1]: http://www.stevelawson.net/2011/12/why-ive-taken-my-music-of...

[2]: (warning: will autoplay video; important bit is the linked comment) http://www.youtube.com/comment?lc=nDvhKYygZTshP0TGDq8ZjxVo0M...

[3]: http://gigaom.com/2011/12/11/why-spotify-can-never-be-profit...