Bitcoin's market cap of approximately 12 Billion dollars is dwarfed by Visa's credit purchase volume of $981 billion for 2012.
I agree with you that bitcoin still has room to grow. But when it comes to calculate how high, why is it that the two numbers in the quotation above are comparable? Why do you choose Visa's credit purchase volume totaled over a year, as opposed to a month, a week, a day, a decade .... ?
Its true those two numbers are not directly comparable and that is a weak point of the article. What I was trying to demonstrate was how small the Money Supply of bitcoin is compared to the moneyflowing through the major payment processors.
Many merchants dislike the fees imposed by Visa ect and Bitcoin can offer an alternative to these services. If Bitcoin was to become a major form of payment then its market cap would have to rise substantially.