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.
I don't think that it will get to that stage because bitcoin is not a physical currency like the US dollar. You don't need to go anywhere to sell your bitcoin, you can simply do that with an exchange in your bed room. Going to sell your bitcoin on the street to an unknown person is very risky because you can be robbed of your bitcoin as we have heard of so many kidnap cases of crypto investors a few months ago.
We have black market in Africa because banks does not operate 24hrs but exchanges operate 24hrs and you can sell or buy your bitcoin whenever you want from your comfort zone.