He doesn't blame the Kindle at all, which surely must be at least as responsible for the downfall of Borders as the iPad, but that's beside the point.
How is this any different than any other technological change that shifts and eliminates jobs? Surely, publishers won't need as many people in printing and distribution. Authors are moving away from using publishers at all and going more directly to readers, which will certainly lose jobs at publishing houses. Any jobs created in technology in the US will move away from booksellers and record shops in the communities to places like Cupertino or Seattle.
I'm really not so sure that his concerns aren't valid, at least as valid as any concern about changing technologies, particularly considering it seems we don't manufacture many consumer goods anymore.
I don't know what can be done about it, though.