However, if you teach people how they can obtain DRM-free material, store it, and consume it in that format, that and only that can make the difference.
Amazon is effectively a monopoly at this point. Many books are available exclusively through them. I doubt that the US court system would look into this segment of market any time soon. They still can't decide what to do with Google, and that took them how many years? I doubt we will be able to resolve this problem in our lifetime.