Dropping out != a path to success in its own right. The reason these famous dropouts are successful is because they were either intelligent and worked hard, or they got lucky (iirc, Zuckerberg only dropped out after he had a viable product, so that should hardly count).
It seems to me that the media is pitching dropping out of college as a magic pill. If you're ready to put your head down and work your butt off then more power to you, but getting out of school isn't even half of step one.