There is no need whatsoever for SE to so blatantly copy Warcraft/Warhammer goblin lore. Goblins are already in the game, just not fully utilized like many other such factions. They're part of the beast tribes, and they're simply absent at the current time, though the lore we have at the moment indicates we'll likely see them more frequently soon.

Quote Originally Posted by http://www.eorzeapedia.com/wiki/en/Category:Goblin
"The goblins are short little monstrosities, though amicable enough. Time was they could often be seen throughout the streets of Ul'dah peddling wares. You will certainly know one if you come across them. They never take off their distinctive masks, and always bear seemingly unbearable packs on their back. But I fear you won't come across them. None have, in fact, for quite some years now. Some say they only make one great pilgrimage every hundred years to the cities of man. But who is to say? Perhaps the recent rise in adventurers such as yourself among us will bring them back once again." ~ Vavaki, Ul'dah

Strange gas masks and large backpacks are the trademarks of this tiny beastman race, the Goblins. Many are gatherers (Disciples of the Land) or crafters (Disciples of Hand) and they helped support the economy of Eorzea from outside any city walls. However, within the past few years, it seems that the entire race of Goblins has embarked on a pilgrimage undertaken by their people once every hundred years.