Wait. This guy is claiming that publishers are trying to push book prices down, and Amazon is trying to keep them up. This doesn't jive - Amazon has cut the prices of books so incredibly heavily since they came along, and had a very good shopping experience with reviews, excellent customer service, shipping, and so on.
I think people are afraid of any company getting too powerful because of the abstract concept - but myself, I'm starting to get comfortable with companies like Google and Amazon taking large share by being the best. If they get corrosive later, they'll have a few year window where they're still on top, but then someone will come and take them out. But I think the current leadership of companies like Amazon and Google is good enough that they won't make shortsighted bonehead decisions against their customers.