You know, All of this is kind of silly. We all know what's going to happen here. The printers raise their rates to handle the reduced amount of printing they are doing. In order to cope, they publishers have to raise their rates. If they raise the price on the paperbacks, no one will buy them, so they raise the price of the ebooks, driving folks to buy more paperback books cause they are cheaper. As people make the switch back to paperbacks, the cost of the ebook will go down for the same reason.
We are talking about a market that in the grand scheme, is really just starting. Think about how long books have been around, how long people have been selling books. Books won't be going anywhere for a long time. I think that a few things need to happen yet with ebooks before we can really see a change. A universal reader needs to be created and a universal drm free format needs to be created. I need to be able to walk into any store, and purchase an ebook, and that book needs to be able to open on any and all devices that I have. And a real method needs to be created for sharing ebooks. Finally, I think all these technology companies apple and sony, and google, need to get their hands out of the book/ebook market and get back to making devices and let the booksellers publishers figure this one out.
At the end of the day, people as a species will always love stories, and people will continue to consume stories in which ever way they are most comfortable with. If it were up to me, I'd say, just price them all the same. Hardback, paperback, ebook, audio book, whatever. And lets see where the market takes us.