In a recent email newsletter, David Byrne summed it up well:

I also have a funny feeling that, like much of our world that is disappearing onto servers and clouds, eBooks will become ephemeral. I have a sneaking feeling that like lost languages and manuscripts, most digital information will be lost to random glitches and changing formats. Much of our world will become unretrievable—like the wooden houses, music, and knowledge of our ancient predecessors. I have a few physical books that are 100 years old. Will we be able to read our eBooks in 100 years? Really?