A simple estimate of the bitcoin community puts miners in the roughly 10-20,000 range. New card sales are likely less but even assuming an optimistic estimate, we'll say 20,000.

In the first 9 months after the 5xxx series was released, AMD sold 16million 5xxx chips. 20,000 / 16million = .1% Bitcoin is a drop in the bucket at the moment. I'm glad people are being optimistic about bitcoin, that's what it needs, but really let's keep things in perspective.