Judging from this piece, Dvorak doesn't seem to think C.J. has much of an impact:
A number of hopeless citizen journalist initiatives are emerging, most of them promoted by idealistic professionals such as Jay Rosen, Dan Gillmor, and Jeff Jarvis, who are disappointed with the way things are going in the world of news reportage. ...But in this instance, a citizen journalist is no more a journalist than someone who adds comments to a football forum—it's laughable. ...Citizen journalism, to me, is like citizen professional baseball—it's just not practical. You can't play professional baseball just because you think the Seattle Mariners stink. You're not a good enough ballplayer. Yes, bloggers have been breaking news stories here and there, but it's usually because they amplify something that media professionals have already written about but that was ignored by the major media. ...The main reason these anti-Big Media initiatives have appeared is that the media are seen as letting us down in every way. Big Media picks the wrong stories, so we have to use Digg to find the right ones. The media's news-gathering problems aren't going to be solved by bloggers or citizen journalists.