Let put ourselves on the shoe of the owner. In my cognitive evaluation on veracity of bitcoin popularity and numbers there is a big market if I do accept bitcoin as payment and option for a better marketing strategy but the government is not declaring it legal and how would do I compute the taxation.
This would be the thing that would make this stuff complicated because speaking of legality and taxation this would be the main concern if you do have a supermarket and lets say you are the owner but one thing that hesitates to implement or offer such thing would really vary on the decision that would be made on the government which you are on.If you decide to accept it but they decline such request then you cant do anything about it.I have heard some supermarket do accept bitcoin but i actually forgot it though.
I think that if super markets have started accepting bitcoin it means that now ordinary people will use their bitcoin for purchasing their requirements of daily life. The value and market cap of bitcoin will increase more and more by this way.
More people will invest in bitcoin because it is also a very profitable coin business and also usable digital currency. I really appreciate this act.