I think they all should stay for the next three movies. They are growing up as the characters the casting people make it seem as if the hogwarts students are from neverland and don't age. Sorry news flash they get older just like the rest of us and the trio is growing up in about the same amount of time as they are in the movies (almost) it should be illegal to replace these kids. (Emma honey if you hadn't noticed Brad hasn't been doing so hot in the box office your safest bet is to stay with the potter movies.) So what if they look a little bit older then their character I'm 22 and i look 16 I have a friend who is 46 and looks 28 no one looks their age these days anymore so what is the point.