The saving grace for PNW steelhead, as opposed to the salmon, is that they can be both resident and anadromous from the same parents. So, if we can maintain strong populations of "rainbow" in the streams then when conditions for anadromy improve, they will take advantage of them. Has happened on the central/southern CA coast when drought kept the fish resident for decades if not longer. Salmon (except sockeye/kokanee) will be gone.