Personality disorders get a bad rap, because by their nature they are stable and enduring over time. It's hard to change those deeply ingrained patterns. It is possible though and I think it'd be great if more people talked about "success stories" with personality disorders.
My other thought though is that even on the forums that do have success stories there tend to be very few posts. Why? Simply because most people who are seeking support on an online forum are not "recovered" by anyone's definition of the word. They're seeking support because they are still struggling.