Well this is what I think will happen. Milsi may just snap out of his trance in time and get away from the bhoothini's clutches. May leave Panchgani or Panchmeshwar whatever that place is (by the way it does not snow in the former and have never heard of the latter anywhere else other than in K-serials). Depending on whether they are planning to give a break to Shabbo or not the following may happen.
If Shabbo goes on a break: Accident track will unfold. Milsi will either not be found or will be in coma. Ayesha mam will recuperate. If they are serious about starting a Neesha track which they should considering that Shabbo would not be around, Neev may help her. But if she is fixated with shabbo she may make Prachi believe she slept with Milsi and later also pretend she is carrying his child. With Milsi not in a position to refute, Prachi may leave.
If Shabbo is not going on a break, then there will be no accident. Milsi and Ayesha will be back but Prachi would have left with ritwik, assuming the worst. Suki will land there and when she realises Prachi is gone with her child she may blurt out the truth. They may search for Prachi and even if they do find her Prachi will refuse to come back, not willing to forgive Milsi for the ONS. Milsi on the other hand will think she is not willing to forgive his treatment of her, so would'nt bother to clarify that there was no ONS. So more pining and rona dona. Both loving each other but unable to admit it to each other. In all this Prachi will realise she is pregnant with Milsi's child and will decide to go it alone.