I'll be brief. Just to point out the obvious, the implication of my industry colleague's comments is that the situation is terribly complicated but that largely it's working.
I would just point out ways in which it's clearly not working. The first is simple transparency. If none of this is a problem, then why isn't the amount of antibiotic used in the livestock industry in Canada clearly available to the Canadian public? It is not, at the moment.
Second, if the situation is working, then how do you explain the situation of specific drugs, such as ceftiofur, which is administered willy-nilly to chicken eggs, which is important to human moms and kids? We have a study from Quebec showing a very tight correlation between ceftiofur use and bacterial resistance in people--not in food but in people.