Timely post Chris, thanks.
Without getting into the politics or methods of catching sockeye (I do not want this thread to go down that road), I would strongly suggest and encourage those that are on the river to harvest their two sockeye but would like to continue to fish for the day in hopes of catching a chinook, that once they have retained their two sockeye to switch to a more selective way of fishing, such as bar fishing, for the rest of the day to allow the remaining sockeye to continue on their journey.
Yes, people have caught sockeye before while bar fishing, but it is a very rare occurrence. For the most part it gives you a good shot at targeting a chinook and leaving the sockeye alone. Bottom bouncing with long leaders is not selective at all and the odds are you will catch many more sockeye before you find a spring. Once you have two you cannot keep any more and releasing fish with such a long leader is very difficult without dragging a fish up the beach, that should never be done to any fish you intend to release.