Okay, here's what I think will happen....
Shanju and KK get married, but Sanju keeps in contact with Rahul and they become good friends. Maybe Rahul falls for Sanju too
In the meanwhile, Vikram becomes jealous of Sanju-Rahul, and maybe realizes that he loves Sanju.
Something like that
And then Rahul remians a good friend (Kinda like Hum Tumhare Hai Sanam with SRK-Madhuri-Sallu)
What say guys?
Yuks