Something to keep in mind is, Killer Whales are not going extinct. Transients are all over. A very small sub group, the SRKW, are having problems. Who's to say if they disappeared, or there numbers dropped signifcantly lower, another group would fill the nitch in the future? Or, some transients would come in and suppliment the pod? We don't really know. They are not stupid animals and nature can work mysteriously.
As far as mixed stock fisheries go, SG said it right. "isn't it well beyond time that mixed stock ocean salmon fisheries are phased out to make a significant contribution to salmon and orca conservation goals?" I think that rock has started to roll and the trollers know it. This won't be the last lawsuit. May not happen in my lifetime, but hammering mixed stock fisheries days are numbered. Either by the courts, or by dwindling stocks to catch.