To be honest, I think getting modern aesthetics for Viera is inevitable. Waiting on more unique hair is as much of a possibility as them giving us hats. As much as I lay awake stroking the various hairstyles the Viera npcs wore in XII, it's much easier to unlock the styles that fit the skull than spend time modeling and rigging a whole new set of hairstyles for one race and gender. Which is important to remember now that male Viera are part of the equation. They'd have to make two sets of unique hair on top of whatever new modern aesthetics are slated for release.
If I was a dev looking to push out content and shave development time, I'd just release selective hair that is already made.