That is a very interesting theory but I have a feeling whatever is going to happen is for Haseena to use to torment Nikhat with. Then Razia will step in and try to emotionally blackmail Ayan into marrying Humeira and say she can prevent Haseena from hurting Nikhat.
The thing is Razia doesn't know the deal that Haseena made with Asad. If Asad finds out that Haseena is misbehaving with Nikhat he is going to go full out Lion on the Hunt mode and make Haseena and her family pay for their mistakes.
At times like these I really wish Ayaan would come and visit his brother and tell him what is going on in the house and how Haseena is misbehaving with Nikhat and how worried he is for her.