Nah. I'd rather have them both die and see BhoLas be together ruling over Malwa. That, to me, would be a far happier ending.
As much as I adore PriNal, I think it would be better to have them both die. Prithvi wants to free Mrinal from this overwhelming vengeful burden she's taken upon since childhood that's completely ruined her life. She's shown attempts at slight changes in her behavior, but this fight between her "good side" and "bad side" is leaving her completely wounded.
What she saw as a child was traumatic; Tailep only experienced the lack of their parents' existence, made up for by Mrinal's love and protection over him. He had parents through his sister. Mrinal did have Guru Aditya as a fatherly figure, but she also witnessed the horrifying deaths of her loved ones. The peace that Prithvi so dearly wants to give her is possible, but I don't think she'll be able to enjoy the freedom of life as openly as before without feeling some sort of regret or regressing to that "ruthless" stage of her life. This will drive her to internally hate herself, mixed with the love and respect Prithvi has for her, creating self-confusion and driving her probably insane (probably taking that a bit too far).
Ideally, what I'd like is to have one final battle (both Ashish and Sonarika have performed great during fight scenes, and I'd love to see one more). The problem is I don't want it to turn out like Romeo and Juliet either. Maybe both suffer fatal wounds and they spend their last moments fighting. Mrinal getting all her pent up rage and frustration, hate for Malwas out, and Prithvi is parrying with a smile, showering her with praises through poems.
Since there has been too much blood loss, both collapse in the ground staring up at the blue sky. Their hands touch, and Mrinal recites a beautiful poem subtlety expressing her thanks and love for Prithvi. And they both die.
Bah. That sounds Romeo-Juliet-esque. I don't know.