I'm a fairly new viewer of this show so while I can understand the history and impact of Saras and Kumud's relationship, I think from an unbias perspective - Kumud and Pramad have a lot of potential.
I think its appealing to see the pain Pramad is in and how Kumud is trying to understand his pain and how he finally has someone who genuinely wants to care for him.
And Kumud and Pramad's relationship only amplifies the true love that Saras and Kumud shared. Both Saras and Kumud are loyal to not only each other but their loved ones. Kumud took vows of marraige and is trying to fulfill them and Saras is doing his best to make sure she is happy. So I think its beautiful how their care for each other never diminishes - irrespective of who their with...
As they say, love isn't always about acquiring. If you truly love someone you just want them to be happy. So that is what Saras is doing for Kumud..
On a side not - I don't completely agree with Kumud backing off from Saras. Sometimes I wish she had seen through his pain more and realized that no matter what he was saying... eventually he would have needed her. But she had promises to fulfill to her family and why should she sacrifice them for Saras...
So in the present situation - I think a love story between Kumud and Pramad would be very nice. I just hope they don't decide to kill Pramad... at least not anytime soon. And it would be nice to see Saras meeting someone as well - preferably not Kumud's sister but oh well..