To get AK and BC off of the southern stocks you would have to get WA off of the BC stocks. Simply put, I doubt the Tribes will give up Fraser and all the by catch that goes with it.

What would AK get for getting off of others fish? They get all theirs, because nobody else does. BC at least could trade US fish for Canadian. AK would be forced to cut back and live only on what they could produce in their own systems, which apparently isn't enough.