No, economic forces are not completely in our control, not in any meaningful sense of control. The whole human agency thing is IMO mostly bullshit; faced with a modern economy, we have very little agency. Free will is a cool concept, but drop the prices in your store by 10% and everyone will come to you instead of your competitor - that's how trivial people as a group are to control. And companies are all about exploiting this.

So yeah, technically if you, and me, and everyone else agreed not to use Amazon Go and stick to our regular grocery routine, mom&pop shops would survive. But that doesn't take into account the fact that coordination is a super hard problem. One that's essentially impossible to solve for a group larger than a dozen people without creating some strong external incentive structures[0]. On the other hand, a company like Amazon is in a position to unilaterally change the incentive landscape. There's no consumer agency to talk about here, anymore than we talk about agency of sheep being herded.

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[0] - that's also why every society, as it grows, invents structured forms of governance.