I'm sure the track is planned for 6 months as of now.. The way Nia said to Achint that see u after 6 months, its not like she simply said that.. The actors have a broad idea of what is planned they keep renewing the contract, is in very good term with director & other crew, I'm sure they have a fair idea of what is going to happen but just that they don't disclose it😛
Apprx, 1 month before when Shabby was dying Shagun was aware that a leap was going to take place, she was talking about this 2 yr leap.. If a side character know that much I'm sure Nia and Ravi know much more..
Ashvini mam would have got an assurance of atleast 6 months from the channel before investing huge money on new set and usually the new entries have a contract of 6 months, that's why every villian charcter run for some 6 months. So, I feel this track will run for some 6 months, if some unforeseen things don't happen After that may be DD can can come, eventhough it would be illogical b'coz her body is recovered.. But if needed they can bring but its after this track ends.