This is all done to retain Avika's popularity! She is a very well recognised star and hence good for TRPs as she acts well. So they don't want her to leave the forefront which will now shift to Simar's Sasuraal.
Once simar left for sasural, there wont be any story as she would never participate in any more dance shows. Prem's family is traditional and all this would go away from her life and then what story is left?
I guess they had planned the serial to be light hearted with elder sis being submissive and quiet and younger sis being the naughty mischievous ( like in Hum aapke hain koun) but they took the wrong turn once they decided on the roli replacing simar thing. At that moment itself I knew that Simar would never reach on time, roli would marry prem.
My guesses to what happens next:
Simar will find ways to tell but somehow she can't really tell and because of this she will never completely mold with the family and roli will never leave for a long time and by which time, she would have fallen for prem and now doesn't wanna leave!!!!😕
What could have worked out and yet kept roli in forefront and the serial light hearted
- Simar's Sasuraal wale live closeby to Simar's house so roli and simar tend to hang out at both places.
- Prem has a cousin or brother or someone who can pair with roli in a teenage sort of way and he also tends to use simar's help to visit her house since he becomes bhaabi ka ladla
(similar to hum aapke hain koun I know but way better than current track! No death of simar or anyone, everyone can stay in forefront.. They could have cut out that totan character and put this brother chatacter, totan , tho looks cute is otherwise absolutely not needed)
I think this show should be called Circus Simar aur Roli Ka 😆