Yes, the FDA is concentrating on food animals for now. However, you also ignore this which is a general statement on prophylactic treatment. Notice it says "a veterinarian practicing judicious use" not "a farmer". And if you don't think the world is heading this way in general, try buying Metro in Canada, Germany, or Finland.
"In the case of prevention, a veterinarian practicing judicious use principles would consider relevant factors to determine the risk of a specific bacterial disease and whether it would be appropriate in a particular situation to use medically important antimicrobials for prevention purposes. For example, the veterinarian would consider the way the drug acts against the particular bacteria in question, whether it can effectively get to the place of infection, and how long the drug maintains effective levels at the site of infection.
Other important factors veterinarians consider when determining whether a particular drug is appropriate for preventive use include whether: (1) there is evidence that the drug will be effective in treating the particular disease, (2) such preventive use is consistent with accepted veterinary practice, (3) the use is intended to address particular bacteria, (4) the use is appropriately targeted to animals at risk of developing a specific disease, and (5) there are no reasonable alternatives for intervention."