Plenty of games manage just fine to add more ethnic looking faces into the mix. GW2, which is another game that relies heavily on "pre-set" faces, does a far better job with this. They've always had the standard Caucasian/Asian face options, and they've recently added a bunch of black/African faces and hairstyles which are quite nice.

XIV's creator is insanely limited, so I'm doubting they will ever add more ethnic looking options, but I can appreciate why people would like to have the option.