Tug the broodstock issue is a long and well played game but look at the QIN for example they plant numbers that rival the Cowlitz in the salmon river and, while they do get some good averaged size fish back, they don't really fight all that well, even the 25lbers..and the run is still coming back lower as time passes, reinforcing the research showing about lowered survival, fecundity and overall fitness of hatchery fish.
But it still comes down to the ocean numbers. Hatchery fish USED to give us a return rate of 3 to 5% of total planted...nowadays many are struggling to even break 1.5% return from plant count. Throwing more bodies on the pile, and spending a metric S ton to do it won't help the issues and could in fact just make it worse.
Einstein had it totally right in his definition of insanity and yet here we are.