Even if the growth curve for Spotify flattens for iPhone users in the U.S., you still have the entire Android market, and let's not forget that Spotify has an international customer base. To say that they are screwed is an awfully bold assertion.

Apple surely has a lot going for it, but let's not forget that Spotify has a partnership with Uber and is a very innovative company in it's own right. Apple Music just launched. Spotify has been around for 4+ years. Late to market entrants don't have a great track record of user acquisition.