Let's put it this way:
humans bring about the pathway to extinction for many species through many methods (hunting, selective breeding, removal and reontroduction of speceis, etc.)
Therefore, when humans go extinct, it will allow the natural balance to return.
But, what if the balance adapted to humans, and if humans go extinct, would the "balance-o-meter" go off the scale?
I mean, humans WERE part of the evolution chain, and they got into the whole nature thing, so if humans go extinct, the scale goes off.
Same thing with any other predator; for example:
You got a bear. Bear eats fish. If the bear is dead, more fish survive.
You got fish. If the fish die, the bear will die, cause Bear eats fish.
Humans eat vegetables, and animals. If humans are gone, more vegetables and animals will survive.
If they are gone...
But the point is; either way having more or less of any of the mentioned "stuff" is bad. (having more fish = bigger fish eating more small fish.)
However you turn it, it's around fishes and humans
