Who cares about mobile entertainment?

When looking at the latest figures from m:metrics, I am really wondering how much of a serious business mobile entertainment can be. I can imagine that some people may download media for later consumption, but mobile entertainment that is really enjoyable would require a decent sound quality (for music), or a sufficiently large screen (for video). On the other hand, when it comes to business models, I have the impression that pay-per-use needs to be complemented by entertainment flatrates, such as flatster.