1) If Zoya and Ayaan get married then Zoya moves to the Gauffer mansion. Zoya get her father. Her ultimatewish is fulfilled. And Asad will honor that.
2) Asad loves his brother so he will give up any fight for winning Zoya back (+ Zoya says she will honor her marriage for a lifetime) so Asad will back off.
3) Asad's family already hates the Gauffer family because of Rashid and now they may have another major reason to avoid them.
All the reasons mentioned above just makes it more unlikey to have an intertwining story line between the two. I mean if I was Asad..i would cut off all contacts with Rashid and Zoya...too painful.
The only fact that can be justified by a Zoyaan track is Asad's hair. Maybe they will show him going for Sanyas and after a 5 yrea leap coming back with dreadlocks :D
I am such an optimist...I am hoping for the best but preparing for the worst.