I've noticed that a lot of younger people, who grew up with a cell phone in their hand, don't think anything of spending well over $100 per month for phones with email capabilities, cameras, mp3 players, video, etc. It is a whole different mind-set. I'm too old (and too cheap) to want that kind of stuff, but the folks who fit the demographics that everyone seems to think advertisers love, are the ones who will buy them.
I recently helped my 25 year old nephew move. He must have had a half dozen (or more) old cell phones sitting around. It seems every time they come out with one with a new feature, he just has to have it, and puts the old phone in a drawer. I hate to think how much he spends every month on these things. It doesn't seem to bother him any. I don't think he is alone.
The ability to receive streaming audio "radio" over a cell phone will just be another feature that some people will really want, regardless of price. And let’s not forget about video. You can get that too. It's a one box does everything solution. I can see its appeal, even if I may not choose to personally participate. Then again, I just might one of these days.