Where did all the goblins go?

[Legate of Amon Lanc]

Well, when you quote Tolkien, maybe it is not only about this, wars or machines, but if I take what he says, then the Orcs are far more common than it seems. Or "Orc-minds", at least. In the Appendix to LotR, in the part about the translation of LotR to English - which means also telling what the Orcs said there - Tolkien wrote:

But Orcs and Trolls spoke as they would, without love of words or things; and their language was actually more degraded and filthy than I have shown it I do not suppose that any will wish for a closer rendering, though models are easy to find. Much the same sort of talk can still be heard among the orc-minded; dreary and repetitive with hatred and contempt, too long removed from good to retain even verbal vigour, save in the ears of those to whom only the squalid sounds strong.

(I think I'll leave this without comments.)