It's not Blizzard's fault when they've already told the playerbase that blood elves are our high elves and that's the direction they intend for the high race to go. They do not intend to direct the high elf race storyline via a fragmented handful of elves aligned with the Alliance. Blizzard have said they have no real purpose or identity, they're a bygone. Some alliance players have chosen to ignore this and cling to some false notion that alliance high elves are thriving and should be playable. The game shouldn't revolve around their narrow view simply because they want a blue eyed blood elf character on the blue side.
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Show me a Blizzard source that states blood elves became something different when they adopted their new name. Any Blizzard source specifically refers to the blood elves as the high elves, and states that the high elves changed their name to blood elves in honor of their kin. No where does it say they became a new race and that alliance high elves are the high elf race of WoW. No, even the Blood Elf race page on the official WoW website refers to them multiple times as the high elves and every context of the race description talks about them as being the high elves (now with a new name). They never stopped being high elves.