That all relies on the fact that all actors involved have some shiny long term sustainability goals and behave strictly morally. Which as all know damn too well

That all relies on the fact that all actors involved have some shiny long term sustainability goals and behave strictly morally. Which as all know damn too well is a pure fantasy. Chinese fleets swiping parts of oceans clean anywhere they can and are not caught couldn't care less what will be there in 50 years, or some treaties of western countries. Also, you completely ignore 2nd and 3rd order effects - decimation of populations dependent on those missing fish that can't and won't recover as easily as fish can.