The box stores should worry. People want to eat locally. Here's an article from Advertising Age, of all places.
One neat way to tell Big Oil to kiss off is to refuse to buy food that has to be transported ridiculous distances. That would also torque big, corporate agri-bidness, like Monsanto, ADM and Cargill, with their GM food crops.
Talk is cheap -- the only thing that will get their attention is how/where you decide to spend your money.
Farmstands Vs. Big Brands With Consumers Interested in Locally Produced Goods, Marketers Scramble to Get in on a Movement Going Mainstream