I think people should get a group of a couple of hundred together and go outside the gates and protest. Say we wont leave until you agree to give the show an extension of 2 months minimum to wrap the show properly.
If they dont want to replace Nikita, they can concentrate on Shravan and Nirmala. Send him to Mumbai. That way Nikita can do limited shoots and then come back full time in 2 to 3 weeks? That way we can see the Shravan Nirmala equation improving, which means his equation with his wife will improve too.
THAT is how you get creative. They did a good job while Nikita was not around. But now she is available in a limited way, they need to think outside the box. IF they think replacing her is not an option, then surely there are ways around it, other than AXING the show? 
I saw a Tweet by Tarunima Verma about "Hanging on to Hope" or some such thing? So that means the channel does not want to give them time to let Nikita recover and maybe PH dont want to replace her? Well SONY needs to come to the party and give them time. They cant be allowed to just AX the show coz they dont want to give the PH time to tell their story with limited presence of the female lead! This show has been VERY good to this channel. (Despite their biased treatment of it). But it's time for the channel to come to the party and return the favor. Lets force them to listen! Phoney Sony, I hate those people!