From my perspective, I don't see how e-books CAN fail. They are certainly more cost effective and greener than paper, hard or soft cover. There are at least two circumstances that might negate that, however. One, as readership ages the readers die off. I notice so many younger people don't read books much, more like reading posts. Playing games and that sort of thing. Secondly, there may be less disposable income available for literary entertainment. THAT is one of MY concerns. Fortunetly, I have gifters that love me, or are at least willing to buy me off with gift cards. People that care about appearances will probably go with hardcover. Everyone else, if they're intelligent enough, will go with the e-book. I also think Amazon's business model is too good to fail at this point. It would take someone willing to publish for free, or underwrite authors, to ruin it.
Unless Amazon is planning to spin off Kindle and its publishing arm. Its happened to the business I worked for. GM decided Saginaw Steering Gear was too deversified from their intent to just build cars. Even though SSG was quite profitable. I guess it was too distracting. Beyond that they (GM) didn't like the fact that we (SSG), a mere supplier, were making as much as their final assembly people were there by causing a wage spiral. In union v. management, that's known as whipsawing, pitting one labor force against another to artificially inflate or deflate wages. Sorry, got caught there. Bad memories.
Any way, those are my thoughts.
Love isn't blind-it's retarded. Charley Harper
In life, being dead, kind of means you lost. Tor
Don't drink the water, fish f**k in it. W. C. Fields