Recipes using 'ecclectic' ingredients are borne out of necessity. You have the animal, you want (if not need) to use all of its parts, so cultures create these recipes to incorporate those ingredients.

These recipes of course, range from delicious to barely tolerable, and even that scale shifts between cultures and individuals based on familiarity and such.

That's all to say, I don't think it's a bad thing if recipes with unpalatable ingredients go extinct. Conversely if we discovered a new plant/animal, we may create new recipes around its components.

In the meantime, markets for those products would still exists and they would probably become much more expensive to acquire, driving the markets into the ground. So what?