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It’s speculative to say that “Amazon can start turning on major retail profits at any time it chooses.” Amazon has not done it yet, so there’s really no proof that it would be so easy, or even possible. I know the party line, which is that Amazon chooses not to take retail profits because they would rather invest in growth. But invert that statement to understand it a different way: it implies that when they choose t…
Just look at how much money Amazon is spending on Prime shipping. It's insane. They're never going to turn a profit, because as soon as they stop subsidizing shipping customers will go elsewhere. There is no reason to expect Amazon's retail arm to ever be more profitable than Walmart is.
In the end, online stores aren't that hard to build and local stores can become competitive if Amazon really decides to cash out. Amazon is growing so fast because they don't really turn a profit, not because they pushed everyone else out of the market.