By Pete Croatto Chuck Klosterman fears it could end at any moment. The cultural critic and self-described “generalist” has enjoyed great success since the release of Fargo Rock City in 2001: a bushel of best-selling non-fiction books, two novels, columnist gigs at Esquire and the New York Times. But the co-creator of Grantland can’t shake the feeling. In fact, he freely admits his career path was a product of equal parts luck and timing. The popularity of Fargo Rock City came from nowhere. The end could come just as suddenly. For now, though, he’s still here. Klosterman’s latest book, The Nine…