I think things tend to get more simple than complex. Computers SEEM complex, but in reality they have absorbed many tasks into one tool. I remember in the late 1980's in my dorm, I had a word processor, a photocopier, a stereo, a VCR and TV, a game console, etc.
Now, all that is in one box with a couple of periphreals (printer/scanner). Heck, if you look at how much I use the phone the Internet has really overtaken it, too.
So, I think music is just going to be absorbed by what we already have. Maybe cell phones, but my guess is portable computers, hand-helds, laptops, etc., will absorb both music players and home entertainment systems as well. I think we are just a few years away from seeing really powerful hand-helds, it's just screen technology and easy input that is mussing things up.
