We could certainly stop hatchery salmon production in some rivers but I doubt the wild fish are going to magically rebound to historic or large fishable numbers.
We could enjoy watching what is left of them.
Obviously has to be a balance but I hope there are at least some river catchments that are being left or where this could be tried. If hatchery fish are degrading the genetic fitness of wild fish then it really would be pretty sorry state of affairs if we were to lose a wild population just for the present generation to fish. I'd hope they would be around in 100 years or more into the future