With the increase in pops, you may not be able to solo it in 1 pop, but you can stick around and get some JP while you wait for it to pop again !. As for getting clears, I think what would really help boost this event would be adding domain invasion to the campaign rotation. Add drops like pluton cases/boxes to the pool during the event. Scaling the difficulty would be very difficult since any number of players can randomly join or drop from the fight at any given time. Scaling would require constant evaluation of the number of players in the fight and constant adjustment. A campaign would allow for people to get clears by simply encouraging more people to participate. They could also just add plutons, beitetsu and boulders as normal drops from domain invasion. Adding RME upgrades boosts any event !