They will marry, and Devika will not try to fight with Kakul just to please Sujit.
Then she will get her own child, and then the serial will get interesting as step-mother instincts will begin. Uttara will teach her tricks of hiding things from Sujit, and Kakul wouldn't say anything as she would be busy in saving Samman from Vanshika...god I hate Samman..he is such a cheapo. He should know that he could take some other manager with him for his meetings with HVG. Why create misunderstandings.
Anyway, back to topic: shaadi to definitely hogi. Only that either Devika will only care for Sujit and his baby, and so tensions will creep in between them as Sujit loves bau sahab and kakul. or she would be nice for a while and change. She has to be bad, as thats her nature. She is just an opportunist.