I think TES have enough unplayable races right now ,and do not need more being created, I mean we have SLoads, Imga, All three akaviri races, Left handed elves, Maomer, Falmer, Aldmer, Koguthi ( or whatever was the name of silver skined humans from black mash) all the khajit and Argonian variations and so on, and lets not forget about Oblivion native inteligent races like Dremoras or golden saints.
That said I don't think TES should include any new races any time soon.