The music industry has been selling music without DRM since recorded music was invented. I don't think there's any surprise that they survived by continuing to sell without DRM.
9 years ago Sony was panicking, realizing what they had done, and began infecting users PCs with malware in a desperate attempt to undo the "harm" they thought the CDs lack of DRM was causing them.
And of course the movie industry was surviving without DRM for some time too. Both thought that lossy analog copying was DRM enough.
