Two things:
First: G.Khan says that to be successful it has to sell in the US??? Why I cannot understand. The 747 is considered successful and how many are operated by US operators ... not many. In the US they are upgrading from 767 to 777 in the main.
Second: The A380 has become the second most successful airliner in terms of sales numbers before manufacture after the A320. So I have no doubt things will proceed on track.
Have a nice day