You think the chances are "quite high" of all other countries doing this? There are several countries that inherently have to import food because they don't have enough arable land to feed their population.
Yeah, and they already buy plenty of shit food from America. They aren't going to buy more oreos to these countries just because America can't sell them to America any more.
But of course they are, because the price of that food would go down. If it's still being produced because it's still being subsidized but Americans stop buying it because it's punitively taxed, where do you think it goes?