Emma Watson to be replaced for climax???

Director David Yates has said that,climax of the HP and the deathly hallows which obviously needs the actors to be portrayed nineteen years after their 7th grade,will not be played by senior actors.Instead graphics and make up will be exploited to the maximum extend to make them look older.Even then there are rumours that Emma Watson will be replaced for the climax by someone bit older but that is still not confirmed.