Soon Bitcoiners will start selling Bitcoin the way dollars is been sold in the local market. It might sound unrealistic but the future is not far fetched. This will happen mostly in the less developed nations especially African countries. With all due respect to Africa and Africans but this will happen someday. You see the way airtime is been sold across the streets with different prices ranging from one hundred naira to one thousand naira? that is how it be.
Are you moving backwards or forward, if you are being frank you will see that airtime being sold on the streets has reduced drastically as people can no purchase their airtime through their bank or make use of online airtime vendors.
I really don't understand what you mean by Bitcoin being sold on the street. This will not be the case in the future because the future is meant to develop and not draw back. There are so many online vendors selling and buying Bitcoins already but personally I don't trust trading with any online vendors service, through an exchange is better.