If gene flow from golden rice managed to successfully hybridize the four gene complex providing the iron, zinc, and beta-carotene nutrients into other rice crops, that would be incredible. It's so unlikely to happen and the scientists involved have to work so incredibly hard to get it to happen, because it would be a tremendous good for the world if it did.
We could only hope that such gene flow would occur naturally from the golden rice.

















What does that furthermore have to do with anything? The selective pressure of a trait that uses up more plant energy to focus on its nutrient production and that is only beneficial to humanity and not wild species?