Personally I think the future of printed books is quite grim. With the addition of videos pictures and sound coming to ebooks in the future the younger generation coming through will have a much ricer experience with reading books. They'll come a time when they'll say things like "you read books on paper!?"
You look at the decline of tapes and record players and you don't think the same thing will happen to books? Maybe people who have only read paper books such as ourselves will continue to but the younger generation with their ipods, ipads and ipids (whatever one of those is) will embrace ebooks.
In 50 years time I don't think there will be a bookshop open in your town. Sad but true.