Back when I involved in managing the PS Springs, and other species, it was recognized that while the springs were over fished that the only fishery we (WDF) had meaningful control over was the sport. Their overall presence was too small to suggest restrictions. Too much loss in catch for gain in stocks that were, even if goals were met, were very minor players. At the time, if memory serves, Skagit was escaping a grand on a good year and the rest were lucky (as are many duffers) to break 100.

If, as seemed to be occurring in the 70s/80s, the springs make an outsize contribution to black mouth fisheries then as they "recover" the issue will come up again. Remember that, at that time, it was a year-around fishery.