I really like the concept here. Even the silly hair! I think this really cuts to the heart of what modern Quel'dorei are in Warcraft.
Lots of folks are raging against this, or saying 'no more elves,' but I think it's worth examining just WHY people roll new races, what makes Quel'dorei a valid concept.
The simplest reason: appearance. And it's a biggie. We don't want something that detracts from an existing Horde race. Well, Pandaren and Void Elves already blow that argument out of the water. And really, how significant is this? I've got half a dozen toys that can make me look like pretty much any existing race I desire (including Belves).
The other big one: racials. But this is mostly irrelevant to a discussion that generally stays away from mechanics.
So, the most significant reason? The fantasy. To be part of the game world. It feels good to roll up an undead, go through Silverpine as one of Sylvanas' soldiers, live some zombie escapism. Being a hulking, noble Tauren is some folks' preferred way to experience Azeroth. It's gratifying to rally behind leaders, have a place in your faction, fight in support of it (hell, BfA is built around this whole concept).
And this is why people keep asking for High Elves. They're not a new elf race. They're the first elf race. The one who defines such a significant part of the Alliance, in the novels, in the RTSs, in Wrath, MoP, Legion. And this is because they define a unique culture - very different from that of the Blood Elves. In fact, the schism between them has existed since long before the 3rd War.
Silvermoon has always been magocratic, exceptionalist, with hints of fascism. They're arrogant, aloof, yet selfish and pragmatic. When the Horde came, they sent a token force to Lordaeron, the bare minimum to honor their commitment to the line of Thoradin. These were not the elves who fought and died alongside the humans and dwarves. No, those elves were the farstriders under Alleria. Farstriders who already lived outside Silvermoon proper, on the outskirts, who were sniffed at by the leaders of their society, who placed a deeper value on duty - both to the line of Thoradin, and to a world in peril. These elves were individualistic, zealous, and honor bound.
It's this same sense of duty, and near single-minded devotion to a particular set of values, that drove a large contingent of Quel'dorei to again break with their kingdom, and accompany the Sons of Lothar on a suicide mission to Draenor, even as Silvermoon had firmly turned its back on the Alliance. This same mindset that drove these Farstriders to reject Kael, the magisters, the fel, and stick by their allies and their identity after the devastation of the 3rd War.
Some supporters invoke the whole Legolas concept, but one of the things I actually most appreciate about Quel'dorei is that they're not Tolkien elves. Sure, they have values, they've their own system of honor. But this also fuels vengeance, zealotry, extremism. This is the point of view that led Alleria to spend two years hunting down the orcs fleeing for mountains and caves, and systematically exterminating them after the 2nd War. This is the extremism that drove the Silver Covenant to attack unarmed civilians in the Purge of Dalaran. They are dogmatic, they never forget a grudge, and this does not make them good guys.
We can't play a race like this in WoW, despite how heavily the Quel'dorei have featured across multiple expansions. I'd like to be able to play as one of these elves, someone who identifies with Quel'dorei culture, who can rally behind the High Elf leaders already in game, who can represent that fierce, dogmatic heart of the Alliance, who is invested in the High Elf storyline. This doesn't necessarily mean they have to look like blue-eyed Belves (honestly, if they'd made Void Elves out of Sons of Lothar High Elves, transmogrified against their will, I wouldn't be making this post). But they NEED to be Quel'dorei.