I think the article raises some good points. As a non-American, I worry very much about the 'dominance' of Amazon. I sincerely am rooting for the Apple Tablet to be a serious challenger for the Kindle
I think that if the first iPod Touch had been tablet-sized and marketed as a tech 'companion' i.e. for web surfing, gaming, video and reading, it may have been a major force and the Kindle might never have happened. I for one will not be shelling out any more $ for hardware until someone achieves global dominance and is declared the 'winner' (OR until everyone is using the same format and DRM ceases to be an issue).
The one complaint I have about this article is the fretting it does about the need to preserve/protect the bricks and mortar and paper books business model. I disagree that it is necessary to, for example, restrict the ebook to prevent a 'cannibalizing' of sales of the print copy. I think a lot of people who read ebooks are not interested in buying the print copy anyway; those that are interested will buy it when it comes out. A simultaneous release gives people the choice.