1. The company goes out of business. You are screwed.
2. The company decides to unilaterally change the terms of service. You are screwed. See the review of M$ Zune player by David Pogue in the New York Times.
3. The company releases a new version and immediately disables your copy. Your are screwed.
4. The copyright expires, which means that the product is now in the PUBLIC DOMAIN. Will you be able to get a DRM free version???????
5. DRM is really about locking the consumer into a company product catalog. The obvious implication is that you will need a DRM “player” for each company. Instead of having ONE player, you could have hundreds (figuratively). Having all these different players will be a nightmare. The “piracy” mantra is a red herring to justify laws that legally lock the consumer to a corporate product catalog.
6. Content providers are (will be) using DRM to disable hardware equipment that you paid $$$$$ from working. Upgrading is one thing, put purposely disabling hardware from working is plain wrong.
7. Dirty tricks anyone??? I can imagine companies “disabling” a competitors program from working on your computer. Of course companies won’t admit to these unfortunate “bugs”. The obvious implication is that your computer could become unusable because of competing formats and code.