I already fucking went over this.
Remember open world raid bosses? And how their mechanics are completely negated thanks to the zerg?
Any more open world dynamic content will be pointless and boring unless they do something about it, which I highly doubt they will. They didn't take into account the most used gear set in the game when designing these 1vs1 arenas, so they won't take into account the zerg.
Hardly contain themselves? I can hardly contain my middle finger...