Well, in the case of Assam, those doubtful citizens will definitely have to furnish acceptable documents verifying that they, or their forefathers were legal residents of the Indian state prior to 1971 failing which they will be considered aliens. What exactly will happen to them is still under consideration, but it is believed that they will be stripped off their political rights and incarcerated, till they are repatriated to Bangladesh. But the bright side is the legal residents can from then onwards lead life with dignity without any one taunting them as 'toi Mia ne Axomia' meaning are you a BD Muslim or an Assamese.
Maybe, the rest of India should follow suit.