http://www.screenjunkies.com/movies/movie-lists/netflix-in-2011-how-to-b...
This outlines how Netflix went from putting blockbuster out of business to struggling to compete for its market share. The downfall came from odd business decisions like mistimed price hikes (they were engaging in negotiations with networks) and by splitting into two completely different companies; one that handles online videos (Netflix) and another that does the video by mail (Qwikster). They began to lose subscribers and lose content while raising prices and so they say a sharp fall in stock prices.