I am yet to be convinced that a once daily A380 service between city pairs will be as saleable for premium pax and freight, as twice or three times a day with a B777.
I guess from a passengers view, you have a point. Some may want flexibility to Asia from Aus, for example. But those on their way to UK or US, frequency wont change all that much. From an airline profitability viewpoint on US/UK routes, the A380 is the ultimate solution.
As a pax, even down the back, I will pay extra for the ability to arrive and exit the aircraft without half the world being with me.
Using the QF seat map, the A380 Upper Deck has 100 odd pax up top. From the back, you'll get off faster than a domestic B738.
Main deck has 346 pax, faster than a 744.