Chaitanya is an outstanding character of DSK.He is an obedient son, a loving,caring husband and a wonderful person (except the Aditi things).
The writer will bring an entirely different person in place of Chait,and Anu will marry him. This will destroy the image of Anu too, according to her nature, she is not going to marry again. But if the writer brings Amit as any other character, then our minds will accept the attachment of Anu with him. I think, Aroona ji has a twin for Chait, if this will happen, then it ROCKS!!!