When will companies learn from past copyright history?

Something that has caught my interest of late is researching the history of how the actions of copyright holders progress as they encounter a new technology. In my childhood, I remember two of these periods of time. One is when the music industry reacted to the prevalence of mp3 files and the other is when the movie industry reacted to the prevalence of consumer access to writable DVDs and file sharing programs. In each case, the industry assaulted the technology and did everything in its power to prevent the technology from harming sales. The industry struggled for a while and eventually gave in when they realized that their actions were hurting sales more than the new technology. The music industry reacted by suing people who shared mp3s and by selling DRM (digital rights management) encoded audio files. The movie industry reacted also by suing people who shared movies and by protecting DVDs with DRM. In each case, the industry was met with public disapproval of their actions and eventually someone broke the conventions of the industry and everyone else followed. Ever since iTunes stopped selling it's audio files with DRM, very few online retailers sell DRM encoded audio files. Also, DVDs and CDs are no longer sold with dubious copyright protections in them. Given this history, you would think the e-book industry would follow suit, but surprisingly, they haven't learned anything. The current e-book industry is segmented by various e-book formats and riddled with DRM in almost every e-book sold. It is only a matter of time, in my opinion, that e-book retailers will realize the hassle they cause for all of their customers and sell non-DRM e-books.