Agree, 380 to DFW is one of the few positive moves Qantas have made,DFW is a massive American Hub, and a much better airport than LAX!
It also enables Qantas to eliminate the costly Brisbane stopover on the way back, and whilst seats may well be blocked on the 380 on the return, i believe that this occurs on the 747 as well?
The bottom line is Qantas, for better or worse have 12 A380s,so they need to maximise their utilisation and, given the 380s massive passenger appeal, were possible put them on routes, were the opposition dont have them!
And the Pacific is just that market!