1) There are consequences (economic and social) beyond what goes on our plate to "fishermen will go out of business". In many places, especially in underdeveloped areas, fishing is subsistence and the consequences of fisherman having to find alternative livelihoods can be problematic.[1] But even in the developed world, overfishing can have serious economic impact.[2]
2) There is no automatic guarantee that fish populations will recover, or recover quickly enough. While complete extinction is rare[3], some species have come close (several species of whales and sharks, for example) and can take decades to recover. In addition, destructive fishing techniques like bottom trawling can destroy the environment needed for a recovery. There is also some evidence (not, as I understand, conclusive) that in the absence of native fish, especially if their population is depressed for a long time, could allow less desirable species to displace them.[4]
1) There are consequences (economic and social) beyond what goes on our plate to "fishermen will go out of business". In many places, especially in underdeveloped areas, fishing is subsistence and the consequences of fisherman having to find alternative livelihoods can be problematic.[1] But even in the developed world, overfishing can have serious economic impact.[2]
2) There is no automatic guarantee that fish populations will recover, or recover quickly enough. While complete extinction is rare[3], some species have come close (several species of whales and sharks, for example) and can take decades to recover. In addition, destructive fishing techniques like bottom trawling can destroy the environment needed for a recovery. There is also some evidence (not, as I understand, conclusive) that in the absence of native fish, especially if their population is depressed for a long time, could allow less desirable species to displace them.[4]
[1] https://www.researchgate.net/publication/319680762_When_Over...
[2] https://www.pewtrusts.org/en/research-and-analysis/fact-shee...
[3] https://www.pnas.org/content/114/31/E6274
[4] https://www.sciencebuzz.com/jellyfish-apocalypse-problems-ca...