How long was Concorde used after its sell-buy date.
The issue here is that us FT's prefer the nose cabin for F and UD for CW compared with a 777 so the pax demand is there; tatty cabin or not. Well, not too tatty.
Tatty 747 vs new 777? I would still go with the current level of tattiness of BA on the 747.
Cannot comment on the 787 but will it be different to a 777 interior? Think not.