Pretty sure it will come down to an insurance decision. The Lloyds and Airclaims surveyors, together with the Boeing repair specialists will have assessed the damage and the cost of putting it back in the air. This will be compared to it's quoted book value at the last insurance renewal, (or value assessment if later due refurbishing etc.) BA will then be told what the underwriters will pay, be it repair or write off. It will be up to BA to make up the difference between write-off value and repair cost if they want to fly it again or buy the 'scrap' from the insurers to be retained as spares. Pretty much what others have said previously.