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

[Lauront]

2.0:
-Sudden influx a Miqo'te men
-Sudden influx of Highlander women
-Sudden influx of Roegadyn wom-...oh nvm that

3.0:
-Sudden infestation of Au Ra, a race never known to exist.

None of which are incredibly rare, unlike half breeds, and in particular half-elves.

In summary: spurious argument is spurious.

I would be seriously annoyed if they eschewed a new race idea for some silly half-breed. That said, I'd welcome new customisation options for existing races.