I feel pretty sure that Lagos would indeed work from Dublin and was there also not talk of PIA putting Dublin in the picture at some point after they started Barcelona. Well, Barcelona has started so let Dublin roll? However, the 777 may just be too big and the A310s may be nearly past it for today's more discerning passenger? I am sure Karachi would fill easily enough but I guess that PIA could get better yields elsewhere?
Lagos is now overdue and would get the good yields too.