Monopolies tend to die. Sure, there might not be any competition from other companies, but their biggest competition is in the mass distributed and downloaded pirated book market.

As an example, I only buy non-DRM PDFs, but I never distribute them. Ever. And I never will, because those who use non-DRM PDFs get my hard earned money as I will then get to enjoy and profit from their works on any device that I so desire to use.

Now if, for example, I got a DRM encoded book and it was taken away from me due to some ridiculous arbitrary decision, I would be sorely tempted to get a non-DRM encoded copy of the book that I purchased. I think, in fact I know, I would be justified.

But given that I don't buy DRM encoded books, this will never be an ethical dilemna for me. And I'm no dirty hippy :-)