Grains and oilseeds are a world wide commodity. If the chinee don't buy grains and oilseeds from the US, they'll still buy it. Of course, then the countries that are buying their grains, et al, from them, have to find another supplier. Long run, it shouldn't effect the price of much, more than very short term.
Pork's purdy dayummed cheap ... and beef, on the hoof, although still high ... ain't nearly what it was ten years ago, or so.
Moreover, when retail customers become accustomed to higher beef prices, even when the price of cattle goes down ... with the exception of features ... no commensurate drop in price.
Look at gasoline ... Early, last week, RBOB was a dime lower than its May highs. Retail prices, in this area were around a nickel lower than during May's highs. Then, along comes Wednesday ... wholesale gas drops OVER a dime .... that same day, price at the pumps went seventeen cents higher ... Now, we're priced a dime above May's highs, although wholesale is twenty cents lower.