Good point. Vinyl has seen a slight resurgence in popularity because it's hip, but the long-term decline is easily understood when you consider that pressing plants continue to close down.

http://www.attackmagazine.com/features/the-truth-about-recor...

I don't know why you'd want to bring back cassettes - total pain in the ass. I still like them for recording because analog tape distorts in a pleasing fashion. But for listening, nope.