I think we need to calm down. As I read the article, it is saying that if you think you're handicapped (as in, at a disadvantage, before someone brings up physically disabled people) in society due to shyness, then it is possible to work on it and overcome the handicap to a large extent. If you are happy with being shy, it's OK; no one wants you to change :)
I find being shy an impairment to making new friends and dating, and it bugs me. The weird part is: I used to be a TA in the university, and did a great job. I was able to lecture very well, and got good reviews. But in a social setting, I clam up. However: if I know the people well, I can become quite the life of the party. But when I'm with strangers, I can't just come out of my shell. For example: I could never go to a bar by myself and strike up a meaningful conversation with a strange woman.