Lol, "one last hurrah", you must not realize this request has apparently been going on since the beta of WoW, before I was even privy of the Warcraft franchise. On the official forums, people are STILL talking about High Elves/debating about High Elves with a furor unseen by any other race request to this day. It will most likely continue even if you or me or the others here stop participating in said discussion. Because
someone will always be requesting it until it may happen or the game ceases development.
That's not changing just because they don't get announced at Blizzcon, as many already expect no High Elf announcement for the entirety of BfA.
Maybe it will be "done for a while" but that's honestly what I expected it to be months ago, yet taking a gander on forums shows this not to be the case. What I am sad about is for San'layn peeps, it appears their content leader has lost hope since the recent War Campaign ousted Sylvanas as a selfish villain.
But yes, please. Consider it done. I'm sure there are many that won't mind if certain posters thought "it's over" and didn't participate anymore.