That might have been true of Walmart stores, which are relatively small and cheap to build, but I do not think it’s true for Amazon. The cost of relocating a warehouse is high, the number of places they can put a replacement warehouse is low, and the risk of another unionization push is non-trivial. Especially since Amazon is already beginning to hit head count issues; treating people as disposable drones doesn’t work when you need so many workers in a hot job market. They are probably making their unionization problems worse due to the way they view and treat their warehouse workers.
To be clear, I think they’ll try. What we’re seeing from Amazon is a real inability to react and innovate to new labor markets. I just don’t think it’ll work out as well for them as it did for say, Walmart.
So there might be a lot of, or a least enough to make a difference, overlap in the hiring pool, depending how far they relocate.