Talk about being in the dark , are we talking about 2 or 3 777s to Australia each day?
I pay for J for half my trips to the US and buy W or H/M for the rest in the hope of getting upgraded.
If UA is going for 2 x 777s only , that is a real reduction in terms of seating and seat comfort as well as decreased upgrade availability.
Three flights per day to Australia would be ok but 2 !!!