Only partially true. You assume beef is an inelastic commodity; that we must consume our beef and will pay any price come hell or high water. True for some people, perhaps :P but other people may eat less meat, eat smaller portions, or switch to being vegetarian. The reality is that a world with expensive beef means less overall consumption of beef.
In short, prohibiting indiscriminate antibiotics would make it easier on farmers who already forgo them, but it could still hurt GP's farmer relatives (assuming they're currently guzzling down antibiotics) because the overall market for beef would shrink.
In short, prohibiting indiscriminate antibiotics would make it easier on farmers who already forgo them, but it could still hurt GP's farmer relatives (assuming they're currently guzzling down antibiotics) because the overall market for beef would shrink.