I write stories and have a book coming out next year so I have a dog in this one.
What I have seen and what I have been told by Tor is that ebooks will split the market. You will have a flood of cheaply produced, low-cost titles and you will have a small boutique market of high-end interactive books that cost a fortune and will be updated from year to year.
Every house wants their boutique titles. In the early 2000s those would have been the Harry Potter series. Tie-ins and marketing galore. That was a publisher's wet-dream. The boutique titles, as seen right now, will be a mixture of interactive magazine, tv show, and music video. Sort of like a subscription to a super-version of your favorite cable channel. Words will make up some of the content but a lot of it will be pictures and music. Like mystery novels? Think what you could do if you had four or five top writers pumping out a dozen titles, all tied together, and with it's own episodic tv show. Science fiction is a no-brainer, as are fantasy and spy 'novels'.
By the way, we already have all of this, only the stuff is spread out across a dozen studios and publishers. What will happen is a single house making all things. Okay, maybe a little cooperation.
On the other end of the scale are the books I will be writing. Text edited by a professional and thrown into an ebook template. IF my book sells and IF there is a little interest by Barnes & Nobel and IF I can pull together a tour, Tor *might* do an actual print run - paperback - very limited. Tor said they will help with some local tour dates in the midwest but all travel and hotel costs are mine to cover.
Nearly everyone can be published now. The downside is there isn't any more money to o around.
Welcome to the new publishing.