I don't think it's likely "average aquarists" will ever be breeding saltwater fish. I mean anyone can breed many species if they want to do the research and put in the time, but I don't think the average aquarist is interested enough. "recipes" work for the few species which are already considered easy, but this is hard to apply when the foods become more complex to culture for the harder species of fish.
Within 5 years I think most of the popular fish will have been captive bred with varying degrees of repeatability. Within 10 it will be hard to get wild-caught. Within 25 it may be illegal or prohibitively expensive to keep an aquarium (at least a reef) in many places. In 50? we will be lucky if we still have wild reefs healthy enough to collect from. In many places water will be too precious to run a large aquarium anyways. And this assumes our economies are still able to sustain a luxury industry like ours.
Within 5 years I think most of the popular fish will have been captive bred with varying degrees of repeatability. Within 10 it will be hard to get wild-caught. Within 25 it may be illegal or prohibitively expensive to keep an aquarium (at least a reef) in many places. In 50? we will be lucky if we still have wild reefs healthy enough to collect from. In many places water will be too precious to run a large aquarium anyways. And this assumes our economies are still able to sustain a luxury industry like ours.