The way it was worded in the interview, the quest is only present when there is an “overwhelming” faction imbalance, hence the name of the quest. They don’t state what that threshold was but I would imagine that the slider being at 10/15% currently, 10% for horde, 15% for alliance, that it is no longer considered overwhelming disparity and thus the quest is not given.
So as Ion stated in the interview, the whole point of the quest was to incentivize alliance members to hunt down horde who had only turned on warmode for the benefits of the buff, not because they wanted to PvP. The whole system seems to have been wildly successful as a whole and brought the slider to a great spot.
The whole need for this quest, is that a large portion of horde, who had NO interest in world PvP at all were turning on warmode simply because it was a free 10% buff with almost no risk. Even when Alliance was given the 30% buff, those very large amounts of people who warmode was NOT meant for, kept it on just for the buff because it was still not threatening enough in the world, thus keeping the horde warmode numbers up in total drastically compared to the Alliance. Enter against overwhelming odds, Alliance players are now incentivized to go out and actually hunt horde, not just run into them. Horde players (again who have this feature ON, despite probably not wanting world PvP) who are annoyed by PvP start to die, and decide to turn it off.
What then happens is the Alliance not interested in world PvP turn off their (alliance’s) warmode, after making other horde players also not interested in world PvP turn off their (horde’s) warmode. Thus leaving only the people who actually want to be doing world PvP, in warmode.
You can argue that the gear was overdone all you want and how Blizzard catered to the Alliance, but the fact of the matter is what they did was absolutely brilliant in terms of planning, and literally fixed the whole issue, which took months to develop, in a single week, without needing to do something as clunky as “everybody’s warmode is now off, please turn it back on if you wish to remain in world PvP”.
Just as a note, the quest is only available to people when the other faction has an overwhelming disparity. It appears to have been bugged and people who were sitting at the NPC 5 minutes before weekly reset were able to pick it up for this week, but it is NOT available this week to Alliance who missed that small what appears to be time gap.