I'm a little torn.
I don't like streaming services generally, I prefer to own the music or video or whatever than pay an ongoing subscription and also prefer to have it all on device rather than paying for bandwidth (when it's even available).
However, I do like to have full albums on my iPhone - for example, I have all of the remastered Ultravox albums on there - but rarely listen to them long form in full, and more often listen to playlists of my favourites from an artist or genre. So for me, having access to the full albums on the rare occasion I want to, by streaming, but still to have the music I listen to on balance far more often on the device itself might be a great solution.
Plus, it would mean that I don't need to buy devices with ever bigger storage capacities, which will offset a proportion of the cost of the subscription - the difference between a 64GB and 128GB iPhone 6+ is £90 and whether that is excessive in your view or not, that's the difference, which I can save.
Just need to get over the idea of subscribing to music rather than owning it. I mean, loads of people do it with Rdio and Spotify so there must be something to it.