1) Sid himself today said that he 'might' leave. He stressed on the word might..
2) he loves his show to much and his fans too I don't think he will want to disappoint his fans and leave a show which made him who he is today
3) in one of the articles,it said yuvi will try to mend the confusion between Twinj which means that they will likely come closer and not be separated..
4) Sid is still shooting and by what I see it doesn't look like his shooting is ending in a few days
5) according to the reports,twinj might leave for London,and jasmin had said in one of the interviews that after the leap the show will focus on kunj too and their married life.
6) and lastly there isn't any confirmation. Sid still hasn't said anything and is happily posting pictures on the set which also means that it's not confirmed that he's leaving.
There's still a 50/50 chance. I don't know if this makes sense,just a little thought.