First of all good Job! One of the best Bitcoin introductions i have seen!
Similarly, there's no point in raising the ire of David Birch when he's actually doing service for bitcoin in this interview. He gave it some credibility. We don't need to convince him. We don't need to convince anyone. We just need to present the facts.
In the mean time, let's pick our fights.
I think David Birch makes an excellent Bitocoin antagonist. He has a good knowledge of the payments industry, looks "old enough" to be the grumpy old guy, and he does not dismiss it completely. i have also never hear him bitch about the whole "black market" thingie.
What he will get soon is the whole point of Bitcoin is not that it is anonymous but pseudonymous and you have to work hard to use it anonymously. (purchase with cash/tor/laundry etc..)