The rich, everywhere in the world, will continue to seek wild-caught though. (While they publicly rail against the poor eating wild-caught. Such is how the wheels turn.).
It’s bad for the salmon (in terms of animal welfare) and it’s wrecking the local ecosystems. It’s not any sort of panacea.
We need to stop destroying ocean ecosystems, not just shift the damage around. Overfishing of wild stock, habitat destruction through bottom-trawling and intensive fish farming all need to be properly looked at.
You criticise, yet don't provide any suitable recommendations or alternatives.
People like to eat fish and have done so since the beginning of our species.
Onshore fish-farming is being developed. I don’t know enough about it to have any idea whether it can be made compatible with animal welfare or environmental responsibility.
But it also doesn’t matter. Sometimes you’re just going to need to stop wrecking the place.
I’m suggesting we do that through conservation rather than decimation. But you feel free to throw your hands up and watch the seas die because “people are going to eat salmon”.
Perhaps those who are so insistent that behaviour cannot change could come up with a solution, instead of helpless capitulation to a future of dead oceans.