Well, you have to keep in mind that his prediction about the extinction--and I think he meant the commercial extinction of these fish--was based on information at the time he wrote the paper. Since then, there have been changes in the way the farms manage sea lice.
I referred to those earlier as an experiment. They are treating the fish at a different time and in a coordinated way, and that has had a very positive effect. In fact, I know he's rerun those models with current data and he doesn't come to quite as dramatic a conclusion. However, I think what you have to realize is that we now have an industry whose existence and whose impact on wild salmon populations is based on using a chemical for which we are almost certain that resistance will evolve, and when it does, there's nothing left in the toolbox. We're putting ourselves in an extremely vulnerable position.