I know everyone is entitled to there opinion so i'm going to give mine. I think a petition to get rid of evanna lynch and luna would be a rude thing to do. Imaging you were the one to get a part in what i think is the greatest movie of all time, and everybody thought you weren't right for the part and tried to get you kicked out. you would be absolutly crushed. would you really want to make someone feel that way?

Maybe all the girls who looked like luna's description in the book were really bad actors and evanna was the best. would you want a really crappy actor the play the part just because she fit the description? Personally, they should go for the person who acted the best and then use movie magic to make her look the part a little bit. Looks are something that can be changed in a hurry unlike acting abilities.