I don’t care about the “normal skin” in itself…
I care that the lore of the Void Elves don’t make sense.
Void Elves are few in number and would need to recruit more members.
But studying the Void in itself does not change your skin tone, Alleria proves this to be true.
The only reason Void Elves are blue is because Nether-Prince Durzaan forcibly changed them in his attempt to turn them completely into beings of the Void.
The studies in itself does not change anyone, Alleria had Void powers before eating that Naaru as well, after studying under Locus-Walker.
So I would want either:
Scenario A:
1st Generation Void Elves are the ones that followed Umbric to the Telogrus Rift and were changed by Nether-Prince Durzaan.
Void Elves recruit new members, teach them the way of the Void. These guys become the 2nd Generation, and since Durzaan is dead and there’s no reason to change anyone now and we don’t even know if that knowledge is lost.
The 2nd Generation of Void Elves would look normal skinned, but with the same eye color void elves currently have to reflect the Void energies they’ve been exposed to during their studies, by spending time in the Rift.
Similar to how Blood Elves got green eyes by exposure to fel energies.
Then Void Elves would get to select 1 or 2 normal skin colors when they create their character.
OR
Scenario B
Which I’ve explained in another thread 
Then Alleria would be changed to a proper Void Elf.
I don’t care which… I just want this plot hole to be plugged…