I recognize that I'm a fossil, but I remain very much an album-driven consumer. If I hear a song I will buy (or download, depending) the album simply because I find most singles off albums do not represent the best work of that artist.
I've also consistently had miserable results with Spotify, Grooveshark, whatever. If I want to show someone new music, it's never on any of those services. Maybe that makes me a crazy outlier or something, but the only service that has my music is Google and that's only because I put it there. I was trying to get a friend to play a few tracks from Google's vast collection and they had none of it.
I give Drip.fm $15 a month and don't feel even vaguely bad. I used to give emusic $12 a month until they traded all of their indie labels for access to Sony... that was about the time everyone stopped giving a shit about eMusic.
I think Lefsetz is right: it's gonna be about small bands that can hustle. I have no problems knowing that the bands I listen to will never play anything bigger than a genre festival.