Well in all honesty I think if they were to enable it somehow, they would probably do so through Hyur customisation options. Whether you then slap on a subrace name to it or not is a different story, but they have (evolving) plans to improve on the graphics engine and character customisation (here, here and here), which may make such changes easier in the medium term. Bearing in mind that they had commented in less optimistic terms about these projects in the past (e.g. here), plus what they've been saying about how long they expect the game to last, I do anticipate it will happen at some point after 7.0.
