Remember - technology is only a tool and what happens with that tool is always guided by the ones who yield the most power. It was possible for Apple to eliminate DRM only because they maneuvered themselves into a position of power where media corporations were being lead by Apple and not the other way around. I think the actual reason why DRM was abandoned was because it was just not feasible, for music - remember the horror stories with Windows DRM for music, for instance. Removing DRM was both damage control by Apple and a 'hip' thing to do in the wake of consumer dissatisfaction. I have yet to see a similar push in any other field than music - extremely restrictive licensing and DRM are still alive and well in proprietary software and video content, respectively, and it doesn't seem like there is any change to that on the horizon. It probably helps that the Apple->Jobs->Pixar->Disney link is a very strong one and that video content is used fundamentally different compared to music.
Anyhow - it's always both - big corporations do have to pay attention to the market and both follow the will of the consumer and what is best for their own bottom line, which sometimes overlap. But sometimes they get weary of that and short circuit the system through politics (although that is often initiated by companies that are not primarily in technology). That's where any degree of authoritarianism is quite an asset.