I don't know that Amazon cares about the current Whole Foods business model. They want the over 400 stores to use as refrigerated retail distribution centers. They want to go head to head with the large big box grocery retailers and take their share of the market.
Is Walmart using the call in, drive up, they load and you go system there?
Amazon opened a headquarters and a few warehouses in Texas a couple years ago. It is opening a new distribution center in New Braunfels, TX.