To me this means that we should invest a focused effort in planting coral reefs in protected areas (and protecting additional areas for the same.)
I'm not a marine biologist, but from my understanding the big threat to coral reefs is ocean acidification. If this trend continues, we won't be able to do anything to save the reefs. There's no use in re-planting corals if the entire ocean is too acidic for them to survive in, coastal or otherwise.