If they done that they would then have to do it for the elves and beasts and new races would just be a cosmetic change rather than game-changing.
Anyway...
Is there really a need for it?
no need for it at all, great series the way it is.... that being said, people would without a doubt be happy and excited if theyre were new races in it... and isn't that what games are all about... and as for the series being too far along, i agree 100% but i also feel like they should have the F' it approach and throw em' in anyway... don't hold back bethesda... go nuts!