Is there a reason it could not happen, or do you just think it won't? I wouldn't be so sure in say, ~100 years, that we'll be doing much significant ocean fishing.
Cultured algae, molluscs, crustaceans, echinoderms, and cultured fish versus... wild fish.
So they are removing wild molluscs, crustaceans, echinoderms and wild algae from one side of the equation in an article that focus in the message that that part has decreased. Lying with statistics. If we compare wild fish against farmed fish only, the result would be really different.
And there is pirate fishing also. Some companies under-report a percentage of their captures routinely, to hide that they fish more than are allowed to. Not so easy to do in sea farms when you can't produce more than the space assigned to you.
Trawling and trolling are slightly different fishing techniques. Both are ways to catch fish from a moving boat, but trawling involves dragging a net, while trolling means trailing a baited line.
You're right though, people won't. People won't even stop hunting and eating known-endangered animals.
As was said to you eleswhere - much of the world does have a choice of where to get their calories. Taking from the sea until it has nothing left to give is a profit-driven exercise in the main, not one of caloric necessity.
That's just not true. About half of scientifically assessed fish stocks at or above target levels, thus sustainably harvested, or they are successfully rebuilding from previous overexploitation i.e. fisheries management is working. One can easily consume seafood without engaging in "Taking from the sea until it has nothing left to give". Doing so reduces the land footprint of your diet, and for some seafood like whitefish, small pelagics or cultured bivalves, you will probably decrease your carbon footprint, even relative to a vegan diet.