This is just my two piece of words for this Raima's scenario
They might show that she wakes up but later when Rohit has grown up(more stable ) or has spent more time with Sonakshi at his side , she wakes up and the Doctors advice that while she adjusts to the 4 year gap in her mind she may be given all the supports she needs and that Rohit is there o help her , and we have scenes in which she realises little by little that Rohit has changed , he is not the same person she was in love with 4 years ago some scenes which high light the difference of Rohit in love with Raima four years ago and Rohit now .
Rohit himself is feeling guilty and trying to do everything to bring Raima's life back on track and all the while himself feeling that something is different and although he blames it on the gap in Raima 's mind but somewhere he realises that the 4 years is a long time and he has grown up and is a different person .
And then may be later Raima realizes that she is holding Rohit back from the love of his life and maybe makes him acknowledge the fact that he is not in love with her anymore and and convinces him to go back or actually convinces him that he should stop feeling guilty and live his life fully .
I know this won't happen because this won't be drama , it may be a little more logical in serial world and actually with this thing Sonakshi's role will be just a supporting friend standing and supporting Rohit (long shot)
I don't want the usual drama of two ladies fighting over a man , but some subtle scenes of people changing with time and needing love which also grows with them
Too bad this won't happen but anybody everybody is most welcome to write a fanfiction on the idea