First off, people need to stop making the comparison to other subscription type of services like leasing a car, renting a home, having a gym membership. That's an awful comparison. Hell, even the argument that Spotify is akin to cable/direct tv is specious.
Music is its own unique medium and that brings along with it attributes that don't translate to other mediums.
Having said that, it seems as if I'm one of the few that likes both streaming services and the concept of ownership. I'm not a premium member yet, but I love listening to Spotify at the office or at home. It (along with podcasts) has essentially replaced radio for me. But I still think it has issues with its reliance on things like data providers, recording company contracts, etc. I know that the CD or iTunes album I purchase will work for me 10 or 20 years from know. But I can't say for certain that the music I have access to through Spotify today will remain that way for the foreseeable future.
I don't think streaming services will overtake physical downloads/purchases like others are claiming. Music is a different world than Film and TV. I might watch a movie I purchase a couple of times a year. Same with a favorite tv show, maybe even less. But I can listen to a great album several times a week. It's also not dependent on using both your eyes and ears, and sitting in front of a screen for long periods of time. There's a lot more freedom with music as a medium. Of course this can expand into an entirely new discussion.
I'll continue to both buy and stream music because that seems to work best for me. Obviously it's different for everyone, but the extreme negativity towards one side or the other seems ignorant.