DRM free music is the only way forward.
The next thing Apple needs to do is to drop AAC (which isn't compatible with everything) and switch to MP3 (which is compatible with everything).
...oh, and before you even get started:
Just to add to that, Apple will NEVER do it. Why? Because it would actually cost them so much to do so.
Good 'ol Wikipedia said:No licenses or payments are required to be able to stream or distribute content in AAC format. This reason alone makes AAC a much more attractive format to distribute content than MP3, particularly for streaming content (such as Internet radio).
So try and factor in how many songs Apple sell, then how much per track they'd have to pay to distribute in MP3. You're talking about a lot of money