Amazon is directly responsible for ebooks being so cheap today. The publishers and Apple wanted prices for ebooks to be high.
If Amazon's monopoly power results in low prices for me forever, then I say bring it on.
The ONLY purpose of monopoly laws is as a consumer protection. And if prices are permanently low, like they are in the ebook space, that is GOOD for consumers, not bad.
In another 20 years, those "inevitable" price increases aren't going to come either.