Stuck in the middle

This story from Chicagoland talks about the emergence of Whole Food Markets on one end of the retail spectrum and fast-growing Wal-Mart and Aldi on the other. So called mainstream grocers like Jewel Foods and Dominick's are in the middle and left to figure out how to respond to both competitive challenges.
It seems everyone - Aldi excluded, to be accurate - is high on the importance of fresh fruits and vegetables. To fresh produce marketers, it is a win-win situation, no matter who wins the battle for market share.