He makes logical points, but I think that his point that Spotify can't be or do everything we expect from a music player (like play in the car, he says), will make his main concern moot. He says we're giving too much control to Spotify because they can cut off the music supply at any time and they decide what's on the service. That's why spotify will never "take over" the market completely... it can't fulfill all the market needs, just some of them. People will use it, and they'll use other services/products in parallel to fill the need.