Sid dead track was introduced because of Ravi's 3Dev shoot (Eventhough he had to do extra work & double role in the track😆). Similarly I feel since Achint does many other things like punjabi films, punjabi shows and theatre (most of time her BD is used in show) DD's death will be a temporary track for Achint absence. She may have had some prior commitments or date issues. Otherwise it won't make sense and I don't think she will come in a new avatar. There is no purpose of that. Yash case is solved now.
DD's character may be absent for some time & new track will concentrate on SidNi & Khuranas may be.. My gut feeling😛