This is why ePub is a good e-book format: It is XML (based on HTML), and therefore easily converted to other formats... or easily displayed out-of-the-box. Many new readers can read ePub, and more are adopting ePub along with their proprietary format. And an html-based format will, as you suggest, have better longetivity than most proprietary formats.
In terms of long-term document storage, the more documents we store in ePub, the better.
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