Why so few additions to customization options?

[Zanarkand-Ronso]

I'm hoping that when they complete the texture updates for the character models for 7.0 it also involves rebuilding the character customisation system from the ground up

Thats....a mighty fine Pipedream.
They are simply updating textures, I dont think this means a Completely new CC and character models. As much as we all would like that....
But...hmm, there could be potential for more options, I dont see why that cant happen. But Id still temper my hype.
The characters will possibly look better, but I dont think its this giant Overhaul