When Dev gets Sonakshi fired from her job the first time, He apologizes to her. At that time her parting words are "aap ek paisewale gareeb hai, jo is doctor ko afford nahi karsakte". At that time Dev could not only afford her, but also force her to work for him. At that time he was able to close all doors for her in Delhi. But now since she is rich, he cannot do either one. I mean maybe she will ask for a price he cannot pay and also he won't be able to close any doors for her.
In the episode before holi episode, Ishwari eats oily food and shows symptoms similar to heart attack. When Dev blames Sonakshi as the reason for Ishwari's plight, Ishwari clarifies that Sonakshi is not at fault. Also gkb always said that Sonakshi is not a real doctor. My guess is gkb will have heart attack or something else where the doctor will suggest balanced diet. He may also recommend Sonakshi as the best option. At that time there is a possibility that Sonakshi might refuse to treat her. GKB and Vickky at that time will be forced to tell the truth of how they lied and broke Dev -- Sonakshi. They will have to admit.
The other thing is Sonakshi's dialogue regarding living her love story. Just before the accident Sonakshi tells Dev the kind of love story she wants to live. She also tells that she won't die before living her love story. Dev at that time told her that he never thought about those things. When Dev realizes that he loves Sonakshi he has a conversation in front of the mirror. He says that he feels about Sonakshi the way she described love. He loved Sonakshi as she wanted and not really from his perspective. The whole of their time together was based on Sonakshi's definition of love. Also Sonakshi fulfilled her words of living her love story before her death. With this transformation the old Sonakshi is kind of dead. This separation is the only way Dev can think about the kind of love life he wants.
The conversation Dev and Sonakshi have after she saves Ishwari in the bazaar where Ishwari gets dizzy and falls down is also very significant regarding the leap and separation. When Dev offers her job once again and tells her to name her price, Sonakshi replies "kuch logon ki price tag nahi hoti. Mujhe paisonki zaroorat hai, par uska moh nahi hai". The scenes and events they showed now is the only way Sonakshi would become ambitious and think about making money.
Also in the conversation after Sonakshi's firing, she tells him that aap sanskaron ko sambal nahi pays. Ishwari has taught Dev the name and definition of values, but not the real meaning of it. Meaning in the episode with Noha's lehenga for wedding it is Sonakshi who tells him why Ishwari was correct. She says you have to show Ranveer that you respect him. You cannot just say that you respect him. Probably now he will learn the real meaning of values.
There are several scenes that needs to be repeated and the only way to show that is with this leap and separation. I am very sure that this was planned from the very beginning of the series and is not introduced just like that. The CVs have never strayed from the original story.
This is just my POV. Thoughts and comments are welcome.