Here's the problem about Elwha Chinook and it is, to my mind, the best example of the problems of "simple" restoration by setting only numerical goals. The Elwha Chinook were not as huge as they were (like Kenai) so anglers could catch huge fish. They were big because THAT was necessary for the long-term survival. They needed to be big to navigate the flows, to dig redds deep enough, to move the riverbed, and so on.

Sure, we can have wild Chinook in the Elwha but unless we restore the Hawgs we will get a minor population nibbling at the edges of the habitat. Same with all the other species. We need the coho to smolt as fry, estuary fry, fall smolts, spring smolts, lake smolts, and nomads in order to exploit the ecosystem. We need the repeat-spawning steelhead as well as the age 1-5 smolts.

They all existed for a reason, and that was to optimize population survival. Or, we can choose what is convenient and have fragile museum populations.