Sorry, I hope I am not hurting anyone's POV, but if the writers go about RM romantic angle, it would not work and Mohan's character would not hold the integrity as defined earlier.
A romantic song on stage with grandeur dressing, makeup and dazzling light will not be able to bring chemistry onscreen.
It would s better that Mohan/Gungun's angle be focused and more of Mohan's past.
Shabir is an excellent, talented and natural performer, his role as Mohan can only be more glorified alone than being forced to pair up with the FL who is not of his experience and caliber. She will definitely progress, she has signs for it but to experiment her with Shabir would not be seen fit.
Shabir has so far entertained RM relationship with nokjoks and teacher/student fun scenes, so viewers were able to take it in, but now if they get to serious relationship, there will not be nothing much to look forward to. And now that Radha has turned Mohan into a devotee, what is there to look forward to.
Again, this is my POV, hope not hurting others'.