There are still so many story lines to explore! Why should it end? All the relationships and how they interact once the mystery is solved is one, the Saalekh love story unfolding, the Ragvir story and how they face challenges since Ranvir is not the "legitimate" son, the Sadhna/Ragini relationship evolving as they become more devrani/jethani, the next generation and its interaction with the old generation, etc.
There are alot of ways the show can go on without becoming boring and can focus on healthy relationships and their evolution.There is no reason to end this show for now...