Meredith Whitney's book is about exactly this, that U.S. economic gravity is shifting "away from the coasts" for a bit.
(It just came out today, so I can't say I've read it, just that I've really been looking forward to it.)
For those who aren't from the world of finance: Meredith Whitney was one of the first people on wall street to predict the mortgage crisis.
The book: (not an affiliate link) http://www.amazon.com/Fate-States-Geography-American-Prosper...