Where did all the goblins go?

[Kuruharan]

I am apparently alone in thinking that Tolkien described the end of the orcs quite well.

The Power that drove them on and filled them with hate and fury was wavering, its will was removed from them...

-and-

As when death smites the swollen brooding thing that inhabits their crawling hill and holds them all in sway, ants will wander witless and purposeless and then feebly die, so the creatures of Sauron, orc or troll or bease spell-enslaved, ran hither and thither mindless and some slew themselves, or cast themselves in pits, or fled wailing back to hide in holes and dark lightless places far from hope.
-The Field of Cormallen

When Sauron went *poof* they had to more master to guide their will and they became little more than beasts and that was pretty much the end of them.