It already looks as if the 787 is outselling the 777 which itself is by far the fastest selling wide-body type in production. Any advances on 400 sold before rollout?
My guess is that the 777 will sell more than 2,000 copies and the 787 will easily beat that. Boeing have got it absolutely right with both aircraft.
It is perhaps just as interesting that the Trent engine is the dominant engine on both types.
Just look at two examples of what aircraft technology has done to market growth. The 737-200 Adv opened up the UK regional market for package holidays to thre Canaries and Greece. Result; a huge increase in demand. The 757 reduced seat mile costs dramatically and caused a huge increase in demand for leisure flying in Europe.
The 787 will revolutionise long haul flying by opening vast numbers of non-stop flights between places that cannot be served now. Boeing know that and Airbus have missed out on that vast new segment of air travel.