The only store I know that accepts btc is Steam. Well, I think right now Amazon still has not accepted btc yet. It is not really possible for other malls and market to accept btc. The most valuable application of btc is international trading I guess
It is appreciable that supermarkets are now accepting bitcoins as their payments because it is a facility for the people who buy their needs of daily life in the supermarkets and they have bitcoins to pay with. I am very much confident that in her near future all the supermarkets in the world will start accepting bitcoin as their payments and it I also benefit to the markets owners as it is also a business.