The future...
From what I've see with people I know or hear about on forums, Facebook, etc. most of the objections to the idea of e-books comes from people who haven't actually been exposed to the latest e-readers. I personally have converted several people from doubters into e-reader owners by explaining that unlike phones, an e-reader will go over a week on a charge, that e-ink has no flicker, that there are lots of sources for free and inexpensive e-books out there, etc.
While there will of course be some holdouts who refuse to read anything that's not on paper, I predict that as more people actually see an e-reader, (And, in places other than the US, as they slowly get the rights issues sorted out to make it easier to buy e-books.) there will be quite a few more converts.
Also, as more and more kids and young people grow up having always had access to a tablet computer, and having a lot of their textbooks winding up on one, the younger generation *will* wind up doing most of their reading on e-devices.
So personally, I see a big future ahead for e-books and readers and I don't see them plateauing out any time soon.