I'm not sure why you're asking, but it depends on the ebook.
I think the grossly overpriced ebooks sold using tedious hyped up long sales pages on the Internet will decline, but Kindle sales (another type of ebook) will rise.
Just my .02...
Susan Daffron Logical Expressions, Inc. http://www.logicalexpressions.com Founder National Association of Pet Rescue Professionals http://www.naprp.com Author - Web Business Success, Happy Hound, Happy Tabby, Vegan Success and avid IdeaWeaver software user