besides, i hadhoped nightborne would be attractive enough to get alliance players more interested in their night elf group of elves rather than coveting the horde elves as it gaves the night elves a fancier look that was always a part of their lore, so it didn't feel forced. The hope was then to reconcile the Thalassian elves or just leave the SC on the alliance, but make the night elves more attractive as the complete elven package for the alliance.
having a differnet type of human on the horde, like a Nathanos - just recently undead or vampire, but use a unique model for the horde would have brought that human /elf dynamic to the horde, but in an already horde established feel and setting that didn't reek of alliance, cos their models would be different (based off the forsaken - like Diablo 3 necromancers), this would actually allow those liked the human/pretty white elf interaction at all costs an option, but in a way that was more in sync with the current narrative. your forsaken human or vampire or recently undead (whatver you call it) would have a more european appeal, a more pragmatic, less optimistic type human, more neutral, in contrast to the alliance stormwind human, who's all bright and cheery and girl/boy next door type.
This would finally bring some harmony as elven fantasy would have an outlet on the allinace in a more complete form with night elves and nightborne, while the human/elf dynamic from Lordaron/quel'thalas would have a version available on thehorde for anyone who liked that, giving us a good enough separation, and an opportunity for those who like that to be drawn to the horde without changing its identity. I think this would have been preferable.