It's just pure economics.. nothing more. nothing less.
You calculate the current price per coin divided by the generation rate, then assume that no one has projected expectations, all miners immediately sell 100% of their production. Can you tell me at what rate, historically miners sold as a function of market volume, difficulty, or some other variables? Oh, you can't?
Pure economics. I'm glad you don't run a financial institution. Oh, you do, do you? Well, isn't that cute.
EDIT: I just read the first paragraph on your site. Do you use bitcoins? Surely you realize that your front page blatantly misrepresents the technology.