I think this is a way to bring the Khan family closer together... First Nikhat suffers and then when Imran & Billo Rani's truth is exposed Najma will suffer and they'll get through their pain together like real sisters. Then we'll probably see the return of Mr.AAK blasting Ms. Farooqui for getting Najma into this mess and AsYaan will be reunited in ending Billo & Imran's chapters.
By doing this, Dilshaad & Shireen will face the same pain and maybe Shireen'll be able to see past her own experience and stop following Razia and all of that. And then Shireen-Rashid-Dilshaad will finally unite their kids/ stop restricting them and maybe Asad will see his dad's POV.
Then finally we can go back to Zoya's dad, cuz I'm sure Billo will bring it up to save her own hide and when Ayaan realizes what happened with Zoya we'll see the return of Raabert-Mona.
Then Razia's biggest crime will be exposed and then we'll have to see what Guffoor will do about AsYa...
That's why I think this is happening.