This has been a problem in the States for a long time. What we see now is that the large supermarkets (in my city they are Albertsons and Smith/Kroger) are being eaten by even larger supermarkets like Walmart. Some specialty stores, like butchers, still survive, as do those catering for nitch markets such as organic/"health food" groceries. Its hard to fight lower prices and a better selection of food, though.

Good luck to you, and I hope you come out better than we did.