Samuel L. Jackson, clearly bristling, said today that negotiations to put him in the role of Nick Fury have broken down because "there seems to be an economic crisis in the Marvel Comics world."

Jackson told me today that despite his cameo as the hard-bitten military man at the end of "Iron Man," it now appears that "somebody else will be Nick Fury or maybe Nick Fury won't be in it" when it comes to "Iron Man 2," "The First Avenger: Captain America" and "The Avengers," the announced slate of Marvel Studios projects through 2011 that might have a natural spot for the character.
Source:
Nick Fury no more? Samuel L. Jackson says 'Maybe I won't be Nick Fury' | Hero Complex | Los Angeles Times