I think cvs shot this dream sequence for 3 reasons
1) so that show doesn't loose their audience in all this rhona dhona. which is very hard to believe becaus cvs don't care abt us audience.
2) after naina's confession may be sid is weighing his thali (plate) in 1st thali there is roli and in 2nd thali there is naina (may be that's why she was wearing saree too). She is probably in the dream sequence too. If sid finds out about roli-veeru so called love and marriage we all know which thali he will pick ding ding ding thali no 2. i am certain its this one. if its this one i won't watch this sequence i don't want to see naina dancing with sid. if someone edit naina out of the scene i will watch it.
3) This scene is just to calm us rosid fans down before the big traumatic Rosid scenes, cvs always does this, they did this last time too before khushi exposing roli and whole divorce/manglsutra drama they showed us that beautiful rosid scene. This time it's no different.
Whatever it is I think there is a big storm coming in ROSID's way and us rosidians way. So pace yourselves guys. I know u guys are all happy with this pic, i am too. i won't be overjoyed because cvs like to rain on audience happiness parade. But what u guys think?