Companies like Amazon, B&N, and now Apple, are trying to recreate the success of the Apple/iPod/iTunes trifecta.

I just don't think that's going to happen. Already there are many sources for e-books that do not force the use of a particular reader-device.

http://www.mobipocket.com/en/HomePage/default.asp?Language=EN
http://www.fictionwise.com/
http://www.feedbooks.com/
http://www.baen.com/
http://www.ereader.com/
http://www.randomhouse.com/delrey/ebooks/
http://us.penguingroup.com/
http://us.macmillan.com/
Honorable mention: http://www.gutenberg.org/