Surely with the big 787 order, the A350 couldn't be on the cards???
B777-300ER however is another matter - the aircraft is already in service, could be brought in at (relatively) short notice and has significant additional capacity over the 787s. Perfect 743 replacement (indeed also 744) in fact.
I must say (from a pax point of view here, I might add) I generally prefer the Airbus products, but in this case, I don't see them having much chance. But hey, when was anything cut and dry in aviation?