Just watched this TED talk.
I enjoyed it.
My personal view is that introverts need to position themselves where their abilities and interest lie. I think, and feel, that many introverts are natural leaders. This is especially so for introverts with a clear vision and willingness to achieve a set objective.
Why do I say so?
Such introverts are quiet but acute observers. They are able to detect complex patterns quickly and accurately when some extroverts might not notice. And they do so in a way that serves their vision well. Because of their intimate understanding of complex environments (where they play more of observers initially), and the silent but powerful network they establish with people who share their vision and have unique strengths, they are able to design complex systems and processes and have the neccesary manpower to execute their plans.
But of course, this is not to suggest introverts “rule the world”. Far from it. This is giving balance to perhaps, the belief that only extroverts are capable of helming large organisations. In reality, I think both introverts and extroverts (and this is not a black-and-white concept) have their roles to play.
Therefore, I think introverts should be confident of their abilities, and find the right avenues to express them – at a professional and personal level.
Just my brief opinion though. 🙂
Zi Siong 
I will need to watch this. I’m an introvert and have been denied leadership positions because of my personality trait and the claims of not being assertive enough. I’ve even been coerced to becoming an extrovert which I’ve yet to be successful in. Many preach about diversity but what they really asking for is a seal of approval that they accept all race, gender, sexual preference but not personality traits. It could be that I’m bias because of my own experiences.