You should all go to the general forum & watch this video:
https://open.library.ubc.ca/collections/westland/items/1.0048237
The Pacific DFO was saying there was a Chinook crisis back in 1984. Pristine spawning areas on the Fraser were empty because their Chinook runs were extinct.
The commercial sector with DFO blessing started the Chinook extinction; the sports sector is now helping finish the job. If the read some of the main concerns on this:
http://www.marinemammal.org/wp-content/pdfs/SRKW_Prey_Workshop_Proceedings_2018.pdf
Declining Chinook size is a main concern.
Can you name a fishing group that selectively retains larger Chinook?
As far as the picking on the sports fishers versus the whale watchers first, I'd say that our fish finders pinging on 50Khz which the whales also use was a major factor. IMO I think your insistence on using treble hooks is also an issue as releasing larger Chinook was not working. Not sure if/how much it hurt but I am 100% sure it doesn't help. I see 3 probable outcomes:
(1) The problem is the sports fishers & the closures/restrictions will become very long term. I'd expect that this step will take as long as it took to determine the size restrictions were not working.
(2) After a few years w/o improvement (it sounds like body mass photo studies of SRKW will be used) fishing will open back up & whale watching will be restricted.
(3) More years, no improvement, whale watching starts again. More expensive (from both a political & monetary point) options such as increasing Chinook abundance will be employed.
It is going to be painfully slow; I believe in the methodology but only marginally. If there was this super urgent crisis with the SRKW they should try more than one thing at a time, get the population healthy, then being backing-out the restrictions one at a time. I used to be a Computer Architect in the business world & we would have done the latter method because without fixing the problem fast we would be outta business.