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Concern over the lifetime of media is misplaced - it's a problem of the past, IMHO. With large hard disks, cloud storage and other modern solutions, there isn't really any need (except perhaps occasionally for video data) to write to DVDs or any other future-obsolescent medium.
What matters now is the lifetime of the *data*, not the *medium*. Yes, people will need a good backup strategy, and will need to migrate their data from one medium to the next - but data will generally be held in a small set of "live" places (as opposed to piles of archived disks in a cupboard), which can be easily migrated all at the same time. This is a problem that is easy to solve, and generally people have had to, or will have to, solve it anyway even in the absence of ebooks - so much of modern life involves digital data.
The danger of obsolescence of data *formats* is also over-stated, IMHO. With a bit of googling around you can find convertors etc. for pretty much any old format (word processor, spreadsheet etc.) you care to name. The internet makes it very difficult for such things to be forgotten.
/JB
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