Why not have the best of both worlds? All you can eat music downloads for a low monthly cost, but DRM free. It doesn't exist in a necessarily easy to consume product right now, but it does exist. I could imagine using something like the Zune Pass plus Tunebite giving you this exploiting the "analog hole". Tunebite plays the music files from a virtual audio output and records it in a virtual audio input. Similar to taping songs off the radio, or playing a CD and recording it to tape. The file would go from a protected WMA to an unprotected MP3 (or ogg, or flac, etc), and all you're doing is playing your legal copy of the song.

That way you can burn it to a CD to listen to in your car or put it on your iPod Nano to take to the gym with you, and the file can't be revoked just because Microsoft changed the license. These are completely legitimate use cases. I'm sure such a hypothetical situation would work with Rhapsody or other music subscription services. Various services may embed a code in the file to tie it back to you if it winds up on a sharing site. I don't know if this method would remove that, so I would suggest keeping these files purely for your own benefit.