Honestly, keeping to the XI racial scheme was as much a mistake as making the Au Ra just another variety of kemonomimi. As such, I'd strike miqo'te from the roster... and not replace it. We have a good mix of races as is, too many even. Each nation has it's resident race with Gridania and the elezen, Ul'dah with it's lalafell and Limsa Lominsa the roegadyn. Hyur fit in everywhere so they are a good every race. Gridania, though, has an extra race with the miqo'te with no extra races in the other nations. It's an imbalance. Au Ra are fine given they're obviously not an Eorzean race (even if certain lore says they are).