thought experiment: music

This is just an idea I'm playing around with. Not sure it's a good idea, but pondering potential implications.

I've heard a lot of people suggest that the future of music is a large subscription service where a company has servers that hold all commercially recorded music (roughly like the iTunes store) that subscribers can access anywhere, on demand for a small monthly fee.

For the purposes of this thought experiment, assume this is possible, desirable, and happening soon.
( long rambling post thinking about music and storage and money )