I was asked recently if I would have started my publishing company back in 2006 if I'd seen the ebook tsunami coming and all the changes (upheavals) it was going to cause in the standard publishing model. Hard to say...in some ways it has made things easier - writers can publish their works almost with the push of a button. For publishers still producing works in print, and then configuring them for ebook format, it's a major headache!
And of course, it has revolutionized the self-pubbing arena to the point that old-school snobberies about vanity and subsidy presses are fading fast. In fact, the publishing business model now seems to be a combination of both. Publishers offer both a traditional arm of the business that signs authors, pays them royalties, and produces their books in print and ebooks, while at the same time having a self-pubbing arm for anyone to upload their books. I'm seeing this more and more, and really do wonder where it's all heading. *bemused*