This really doesn't make much sense. The A380 is twice the seating capacity of the A340 and will only be able to land at major hub airports.
How is that a suitable replacement from a business perspective?
Emirates is already the largest purchaser of A380's, what's another dozen or two A380's to them? Emirates will buy Boeing 777-300ER's instead of A340-600's and replace its A340-500's with 777-200LR's.
Airbus should have replaced the A330 and A340 lines with a clean sheet A350 design. Instead, they are wasting huge sums of money on a reworked obsolete 35 year old fuselage cross-section. The 787 will seat 9 abreast comfortably using seats the same size as those used on a 747-400. The A350 will be very uncomfortable for any tall man sitting in a window seat in a 9-abreast configuration due to the curvature of the fuselage. Airlines specifying 8-abreast seating will have more room for each passenger than on the A300/A330/A340/A350 fuselage cross-section.