[Kumabjorn]

What would be a sign that eReaders have arrived completely. That they are so ubiquitous that it is a surprise when people don't have one, like say how you sometimes can't reach certain bureaucrats on nothing but e-mail? They don't want to talk to anyone anymore and if you don't have e-mail, that is your problem, not theirs.

For me, I think it would be that electronic gadgets no longer came with printed manuals, but that you would download it, and it would be offered in MOBI and EPUB for your convenience.