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I feel quite the opposite. Game theory helps understand why people act, & it let's you reverse engineer what they really value, as opposed to what they claim to value
It's like saying physics has been conquered because airplanes should fall out of the sky. No, your existing notion was flawed, but reality didn't change
People don't act towards incentives because of game theory, it's that game theory models their incentives. If you're acting differently, it means you've built a different incentive system
This is important because it means game theory can be used to construct incentives to guide corporate behavior (ie we can avoid tragedy of the commons by forcing externalities to be accounted for, rather than left for the people), but pleas that corporations will act for the incentive of moral goodness is only a method to fool public debate into letting the tragedy go on. Because it's in the corporate interest to not pay for their externalities
Maybe we're getting at the same thing, & I'm just picking up too much of a "shed thy mathematical yolk" vibe