Does anything say 'America' more than a whole family sitting down around a large turkey on Thanksgiving, and arguing over who gets the best cut? Traditions like this may be part of the heart and soul of the US right now - but they might not be twenty years from now. Turkeys are slowly sliding off the Thanksgiving menu, and large ones are being left on the shelves more than small ones.
Millennials tend to be more conscientious than their forebearers about food wastage, so they won't buy a large turkey just so they can show it off on their table. Organic turkeys don't grow to that size, so a Millennial will likely assume that a large turkey has been battery farmed, and reject it on those grounds. They likely don't have room in their house to host a large meal anyway, and even if they did, they're much more likely to be vegan or vegetarian than the generations who came before them.