Frankly, I don't believe anything from the mainstream media that is attributed to an anonymous source. In this case the Wilson's were proven to be politically motivated liars, so now we have to question whether the reporters knew the yellow cake story was a sham or if the reporters were taken in as well.
That's one question I have. Some reporters were probably taken in--for instance I think it likely Novak was set up and anticipated his article would be received differently than it was--but the whole thing seems like a planned psy-op done with the cooperation of media sources friendly to Wilson's political goals, and I'd think some of the key reporters sharing Wilson's political orientation such as Pincus and Seymour Hersh must've been in on it.