The only people I see using this are fanboys. Everyone already uses either Pandora, Spotify or SiriusXM. Apple shouldn't make this move. Against it. Also, Apple will find some way to ruin it anyways.
Is that you, Ballmer?
----------
I'm sure he's already written it. Apple have an annoying habit of ballsing up everything internet/cloud related.
Apple already has millions of users streaming music using iTunes Match. I am doing that right now.