That's not entirely true. Supply, demand and culture have some complexities in them. Humans want meat, but the kind of meat they consume is based on what is available. And then it seems to follow that what they want to consume in the future is based on what was available in the past, not on what is most economical now. A kind of cultural feedback loop which results in most of the shellfish around England being sold in Europe because the English don't want to eat it.

I'm sure this kind of feedback loop happens in a lot of industries. Companies don't just make what people want, they also make people want things. Throw in regulation too, which limits the shape of what can be produced. I think what it boils down to is that when you say people want X, that want is not unshaped by those providing it plus other external factors, so there can be a path to people not wanting it that doesn't just involve their individual decisions.