The biggest 'win' for this thread and others like it was getting the skin customization and eye customization on Void Elves that made them look more normal to open up the different fantasies available for those players. Something that others also thought before would "never happen."
Hair color is a way way way smaller ask in comparison so it will be funny to see the reactions to it.
I already saw on the official forums someone trying to say VE shouldn't get blonde/brown/black hairs even if they're the same shades from Kul'Tiran and not from Blood Elves.
Just take a moment to think how ridiculous that sounds 'no you are barred from these specific colors' - especially when they are hair colors on every single other race but Void Elves.
Brown, Blonde, Black hair colors - every other race besides VE has at least 1 of these hair colors, some 2, some all 3. So the precedent is already there and exists, it's just a matter of when.
Just like how Nightborne will eventually get more customization options in the future as they have the least overall options available - an inevitability that will come to pass. Same as VE hair colors people are asking for.