I agree that Whole Foods isn't a big deal merger but the fact that Amazon has a logistics system in place that could topple the other competitors is very scary. The silver lining to this is that it'll be mostly Walmart vs Amazon now rather than Walmart trying to destroy the regional chains (and Kroger to some extent on the national side of things). Hopefully this will add some competition on the Walmart front to force them to pull back where they're really not needed (or wanted).
But I think you knew that.