How there are any fish reserves left at all is beyond belief. The fact that the Earth hasn't imploded yet is weird.
Looks like the real solution is to genetically modify fish so they always stay within 200 nm of land.
"Czech deer still avoid Iron Curtain"
Humans alive in 2000 years also won't have much worse lives. It'll be a sidenote in biology class "Did you know, there used to be many different types of animal roaming freely, but now there are just two types left, cats and dogs.".
Humans who don't have something don't know how great it was or what they're missing.
Perhaps your ancestors could have told you how awesome it was to ride mammoths into the sunset... But those ancestors are no longer around and we think of them as mostly theoretical creatures.