I am thinking on this same as you.... P ka exit... either willful or by her death. Because the sairat part of story is stagnant until this happens.
If she goes, the third angle will be Jagtap. He is a bigger star than all of them now with a movie like Drishyam which is releasing soon. So the makers will want to cash in on that.
If Jags is now the villain, then V ka MU has to continue... so Saavi ka paternity will not come up.
But to remove P from the equation and her holier than thou image, there needs to be a trigger, in case of her willful exit. Which will be Vinu ka parentage. The other Doc mentioned congenital. Depending upon on what kind of treatment they decide, it will come out that Vinu is adopted, not biological. So kuch karna padega jisse Vinu ka stem cell/DNA kuch mile... something that will help him.
Sai might go to the orphanage or ask V about previous records. Usse shayad pata chalega ki yahi Vinu hai... easy way out... otherwise illegal adoption ka issue bahar aayega, which we complained. The blame may once again go to P that she influenced the decision and got married to V by sly. V-P marriage is nullified. Sai may also support V is P does fake pregnancy.
If P dies by illness then Vinu ka issue will keep simmering but wont bring Sai-V closer.
I dont know... I am speculating.
Kal ka Aish ka article made me think she wants to leave... 😎
Even I feel that, the way her words were written in the article that she wants a child of her own now. Rok kon rha hai ?
But that distant thought made me think again , ki aise hi bol rhi hai.
But she'll get lots of good wishes if she leaves.