Things like this has lead to the death of optional XP in many quests. I've never been a zerger - I like doing optionals and running every quest... but as the optionals get zapped, even I have to question the point of them. All you will accomplish here is possibly adding this quest to the list.
People like easy. Optional farms have been around for at least as long as TRs have existed, "EEEEEEHN" type farms as well, people don't do slayers because they're the best XP/Min but because they're super easy, etc. Killing one option means people will simply look for another.
I do find this mentality particularly frustrating on Thelanis. People just want to run EH raids for an easy completion, a failed run will cause the party to disintegrate rather than encourage to try again with new strategies (or just go back in on EH/EN), and is a server that has posts for Wiz King opts up more often than any other epic quest. Unfortunately between still being on the TR train and being in a mostly inactive guild, I haven't been able to really try and help the Reaper Raid issue, but I do try to do my part for questing. I never do the WK optional farm and always post LFMs when I'm running. I typically have my parties fill even with WK options competing against them, which shows not everyone wants just easy XP. Simply post LFMs yourself, and that is the best way to combat this. There are still a lot of players that are newer/purely social and see what is available in the LFM panel as their options of what to play. Don't make WK Optionals the only option and you can help break people of that habit.
If only more people used microphones, though...