This is something writers are pondering these days. One not only needs to flesh out the content, but know how to create and market an e-book. Personally, I'm just starting to use them for instructional purposes, but find I'm not able to use them for relaxed reading. I do need to give my eyes a rest from the monitors.
I am also a book collector. This makes my acceptance of e-books harder. I like the look and feel of hard and soft covered books. I like to haul them out at socials or bedtime with the children. They also make great props at training sessions and discussions.
I like a real book, but I believe e-books are here to stay or to be further developed. For me, I think I need to keep an open mind and learn more about them. But I won't be giving up my book collection or collecting.