i think that after charu dies, kashish is goin to get married to kartik. this will be due to the fact that if kashish and sujal re-unite the show would have to end. therfore for the show to carry on kashish will get married to kartik. if you think about it the whole ahluwalia family has been introduced and they seem to play an important part in this new plot.
then again this is just my opinion.