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.
Did you say the same thing when Spotify came out ? "Everyone uses Pandora so why do we need Spotify" ?
Having a choice is not bad and it will either succeed or fail based on how it ultimately compares to the other services.