Well, personally I feel that its bad to curse someone, as they will always get the results of their deed whether good or bad. Now this mad woman who cursed Dutta, we don't know if she was really troubled because of or by Dutta. But it's possibly that unknowingly Dutta was responsible for her state, which our Dutta also accepts. Though Dutta has a heart of gold and he helps other but the work he does is wrong. So will this curse really gonna affect his life? As we have been seeing, his own sisters are his enemies who keep on plotting against him. In that case how will he ever have happiness in his life? How far will Nakku be able to bring happiness in his life? Even if she succeeds it will be momentarily. So what will be the future of Dutta and Nakku's relationship?
Guys this may sound too philosophical but just had a passing thought.