What if the reason why there isn't a new race is because...

[NolLacnala]

A thousand hybrids suddenly appearing in Limsa would be silly.

Meanwhile, a thousand horned people show up in Limsa and no one bats an eye

[Lauront]

Meanwhile, a thousand horned people show up in Limsa and no one bats an eye

Hint: they're refugees as a result of Doma's occupation.

Also, I don't buy the "no one bats an eyelid" schpiel. The game has not been fully updated to reflect the reaction of Limsa's denizens to its new visitors, unlike say the Ala Mhigans in Ul'dah and Gridania, who are not hugely welcome.

[Zojha]

Meanwhile, a thousand horned people show up in Limsa and no one bats an eye

Had we known how many tame ahrimen, midgardsorms and behemoth there are, we'd never have lost the war against Garlemand!

[basketofseals]

Meanwhile, a thousand horned people show up in Limsa and no one bats an eye

No one bats an eye is stretching it a bit. Player population shouldn't be taken into account. For example all the catboys running around everywhere. There are very few Au Ra NPCs, and a decent number of them have stories of being not well recieved, especially by Ishgard.