Given the relative rarity and story-importance of Padjal, it seems unlikely that they'll be made available to play any more than, say, moogles. Going from what we know about their physiology and role in the world, I'm not entirely sure they function on the same time scale as normal races- they almost definitely have some kind of preternatural extended lifespan deal going on.
As for Miqo'te- obviously, normal biology cannot be applied in the case of an animal that has major features of primates and felines, which are certainly both mammals but hardly related beyond that. Given that they have feline senses, dentition, and tails, it may be tempting to assume that their ancestors were more cat than chimp, as it were. Elezen, Roegadyn, and even Lalafell might be reasoned to share a common ancestor with Hyur, but I find it unlikely, barring magical intervention, that Miqo'te also do.
As for Miqo'te- obviously, normal biology cannot be applied in the case of an animal that has major features of primates and felines, which are certainly both mammals but hardly related beyond that. Given that they have feline senses, dentition, and tails, it may be tempting to assume that their ancestors were more cat than chimp, as it were. Elezen, Roegadyn, and even Lalafell might be reasoned to share a common ancestor with Hyur, but I find it unlikely, barring magical intervention, that Miqo'te also do.