After the most recent updates, I'm beginning to think this game (at least on Aether) can't handle more than one or two of this sort of time-sink content. When Pagos hit, Frontline completely died. When 4.4 hit and gave a bunch of new PVP rewards, Frontline became super popular again, and Pagos died. A new Rival Wings map and a Daily Challenge would revitalize it for a bit, but I worry that it would also just cause the queues for both Rival Wings and Frontline to be too long.