In 2006 a study predicted all ocean fish will be extinct by 2048.
In 2010 the UN predicted that all ocean fish could be extinct by 2050.
In 2011 the International Panel on the State of The Ocean (PDF) concluded:
As we considered the cumulative effect of what humankind does to the ocean the
implications became far worse than we had individually realized. This is a very
serious situation demanding unequivocal action at every level. We are looking at
consequences for humankind that will impact in our lifetime, and worse, our
children’s and generations beyond.
I am not aware of anything being done. People still buy fish at the supermarket. The oceans may well lose their fish within our lifetimes or our children's. After that how does the Earth continue? Are we really going to pretend that such a huge mass extinction will not change or destroy the lives of creatures we feel closer to, including people?
I post articles about these kinds of things to reddit from time to time. They get maybe 5 to 10 upvotes. Meanwhile people are very concerned about whether their new cellphone has more pixels on the screen than the previous one, or a slight increase in processor speed. Our consumer culture has infantilized us to the point where we can no longer take care of ourselves like adults.