I don't think that kepub will disappear, regardless of readmium, as long as they have to differentiate between books bought from Kobo that sync and books that are sideloaded and do not. I also can't see Kobo being willing to pay adobe unnecessarily, so unless something supplants ADE DRM when the readmium folks get done, my guess is that we will continue to see two different formats--perhaps with almost no difference between them other than what i have noted above.
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