But when everyone gets to play as a High Elf, are High Elves REALLY that special anymore (in lore or gameplay?)
Think about it, if everyone in the world was given a beautiful and expensive blue car, everyone would be pretty happy AT FIRST…but after a while, seeing that everyone else has a beautiful expensive blue car anyway, the blue car would become pretty redundant and most people wouldn’t really care at that point because everyone else has it as well 
Same for the High Elven customization for both Void Elves and Blood Elves…for the Void Elves it’s just fair skin, but I’m pretty sure the lore they will get will still be heavily void-related and focused anyway especially in a future Void-themed expansion. For the Blood Elves it could be explained in a way that the fel taint is already disappearing from their eyes, OR that now there’s no official Warchief anymore, some High Elves (who don’t like the Void group development of Alleria in the Alliance) finally decided to return home in Quel’thalas (they don’t even need to fight for the Horde in the future, they can just stay there) and so Blood Elves get blue eyes too…those Elves could be the ones of Auric Sunchaser (he was already present at the Sunwell for the Quel’Delar quests chains) or the ones that are more strictly neutral than Alliance, like some of the ones in Dalaran…
“High Elves” for both" probably won’t change the faction balance by much, most players who would swap and play Void Elves with fair skin with probably be Humans, Night Elves and Draenei players anyway, so they are players who were already Alliance mains anyway. Blood Elves get quite a lot of fancy customizations (beard, hair, necklace and other stuff) so most Blood Elves players are happy where they are, ESPECIALLY because quite a lot of people actually wanted Blood Elves with blue eyes and it’s happening too.
So, sure, Void Elves could even get X2 or even X3 numbers of players that they have right now because of this…but Blood Elves should still be quite a lot more than them, because as I said most will be people who are already playing as a main alliance character race-changing into Void/High Elves anyway
Well, that’s a given, Elves are usually more likeable (either visually or for their history, or both) to people than Humans, but not just in Wow, also in the other fantasy franchises too…because we are already Humans in real life so with Elves we get to play something that it’s a bit different than us humans, but not too different like a Draenei or Troll (or Tauren like you
)