I could give a comprehensive answer to your Q that touches on all points, but I'll stick to a short and concise one for now.
With the exception of specialized news/data services that focus on a particular market/topic, general news nowadays is no longer unique. Widespread access to the internet has made news a commodity. When one can find a news story linked all over the web, and then expounded upon by bloggers and other commentators, it's no surprise that online financial publications would see their traffic fall. On the web, traffic is the name of the game. If people can get their news on their favorite blogs, they don't need to visit the original content producers any longer.
I guess you could say it's not that people realize that financial news is worthless (which doesn't make it less useless, IMO), it's that the web has produced a shift from a monopoly on news by original content producers to a more distributed network by way of linking. You can't link a newspaper, but you can have unlimited links to an online news article without anyone ever having to visit the original news content provider.