I have this feeling that it's Alia that will dump him. He will be shocked because he would have never expected it from someone who seems so docile like her.
Alia is extremely competitive and wants to be No.1. She also harbors dreams of going to HW. Karan Johar and Mahesh Bhatt didn't even like each other and she managed to worm herself into KJO's heart to the point that he give her any movie that she wants. She is smarter than she seems and the Bhatts in general are not the types to cry and collapse if something goes wrong. They know what they are doing.
I think RK was her childhood crush and she's enjoying being seen as his girlfriend. Once she stops being enamored of him, she'll walk out. The Kapoor bahu tag means nothing - what is it going to give her? Their legacy doesn't exist anymore. Raj Kapoor is long gone. RK Studios is finished. Even Rishi is no more. Kareena is seen more as an Ali Khan, not a Kapoor. What more can the Kapoor tag give her that she already doesn't have?
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