Harsy...I do not think any actor is that indispensable that Rupu or Zee will allow them to dictate major changes in storyline...I remember Ashish saying in his IF interview that ultimately the twists and turns are the producer's decision.
If Rupu breaks 2Ds relationship...she knows that everyone will stop watching TD...troubles and problems will always be there...DK wanting D to marry Abhi sounds very filmy...well it might happen...but D will never marry anyone else..I think Abhi will help DK to recover