Copyright for music is already dead. Consumers like free music. Sometimes they'll pay for concerts, or merchandise, or convenience, or ignorance, but that's it. They might tell you it's wrong on an opinion survey, but they keep downloading.
The situation isn't going to change any time soon, either. Widespread use of DRM'd hardware might work, but the early adopters you'd need to get the new media formats off the ground already benefit the most from free downloads.
Books, movies, and TV shows haven't been devalued yet, but only because ripping and (especially) downloading them are still inconvenient to most people. Bandwidth can't stagnate forever, though. Like with music, when you can download a two-hour movie in ten minutes, and store them by the thousands on your hard drive without missing the space, the only way to prevent rampant piracy will be to stop selling media.
Regardless of the legal niceties, the marginal cost of digital media is zero plus some rounding error. Isn't that a radical enough departure for us to ask whether copyright itself, rather than just its expiration date, might have to change?