The one thing that no-one has yet revealed is exactly how much they are paying for the aircraft, or what the terms of the deal, or any trade-in options are worth.
In this business where aircraft are bought "off-plan" often before they are even designed, it's more about the bean counters, than whether they are the ideal aircraft for their routes.
No-one would deliberately buy a complete lemon but it's often the case that the ideal aircraft is not the cheapest one on offer. Play the manufacturers off aginst each other or even against themselves by getting a quote for something they want to push and get the best deal that way.
I can't really see that many high density routes where the A380 would be ideal for BA. On the atlantic they want frequency of service, and on the Caribbean and most African routes they don't need the capacity. Other destinations such as the Indian routes problably couldn't handle an aircraft of that size at the moment. The only routes it might work is the Far East/Australia and Capetown/Jo'burg or Hong Kong.
Having said that if the price is right................