...then Blizzard should have had Alleria leading a band of High Elven Rangers. Having been completely disconnected from their people since the Second War, when they returned, they wouldn't understand all that had happened during the Third War and beyond, and would naturally just try picking up the pieces of their former lives alongside the Alliance.
Much as Alleria is seen sporting some pretty sweet war-paint (tattoos?), have these elves firmly planted as more rugged (giving them the same sorts of facial-hair designs as Void Elves now sport). Maybe recognizing their former kingdom being split in two now, you could still give them a new name ("Wood Elves" seems overused, but along those lines), with a more Ranger-centric culture, but with carrying on with Priests and presumably a few odd Mages and Paladins.
Void Elves are just *SO* out-of-nowhere, I feel like Blizzard made a huge mistake with them. I mean, two of the Allied Races are dark, purple elves, which we already had, and the "lore" behind them just feels really shallow and contrived. Realistically, there's no way they could have established any sort of "culture" of their own, and it makes even less sense for Lor'themar to exile them for using Void when historically, he lead the Blood Elves when they were using fucking FEL magic!
I dunno. It's just the one race where I feel like "maybe Blizzard really *is* running out of ideas, because that's really grasping at straws". Especially when, in my opinion, Blood Elves still never really got their time in the spotlight (even in TBC, their role in the Horde was secondary, at best, to Orcish architecture and armor-designs). As someone who really resonated with the Blood Elf campaign in the Warcraft III: The Frozen Throne expansion, I feel like they're a race that could have been a lot more exciting, but always wound up sidelined (though I love the character they've made of Lor'themar).