From Dev's side of the story, what he does is acceptable. He has lost his memory, he is brought to be believed that Kanika is his wife and Deepak is his son, he has been living with this family for 5 years, longer than his life with Radhs. True, deep down in his conscience he has room for someone else, yet so far no one has given him space to retrieve those feelings.
Hence, can we blame Dev for loving Deepak as his own son?
Fine, I'm too in the category of which believes that Deepak is not a biological son of Dev. BUT still Dev thinks that he is his son. Moreover, for the child Dev is his father. Irrespective of the fact that if he is biological or not, a father is a father for a child and it is a crime to deprive the love of a father from a child. (We'll just leave the vice-versa formula for the moment.)
Thus, is it reasonable to think about a union where a child's father is snatched away from him?
Saying so, looking at the problem from Radhika's perspective, she has patiently waited for 5 long years for her husband to return, she has been tested so many times in life, she fights against all sorts of barriers that are laid in front of her; just for the undying love she has for her husband and on the firm belief that her husband is alive in some corner of the globe.
In such a situation, is it acceptable to burden Radhika with a child, whereas she herself wants to build a life with her husband and is it right for us to ask for her to sacrifice her dreams with her husband for the child's sake?
In my point of view, for Radhika's sake Dev should come back to her minus his baggage (Deepak) as it is unfair on her to expect so much as to sacrifice more and ask her to accept the kid as well. Furthermore, it should be her and Dev's kid who should be the heir of the family not Deepak. It would be pure torture on Radhika if the child is thrown on her as that would be a betrayal of her undying love and faith. And I do not want to see Deepak at PB as well. But at the same time I strongly believe that the child too should not be deprived of his father's love.
I myself cannot figure out the answers for the questions and contradictory arguments I have. I feel the CVs have put the entire story in big muddled tangle and it would be very difficult to untangle this mess.
It would have been better if I too have got a memory loss just like Dadima or Dev so that either I can forget that there was a leap of 5 years where RaDev were separated, so that I can be happy on the day they reunite and imagine that they were never seperated or I could take their reunion as the starting point of their love and then carry-on. But unfortunately I have no memory loss! Thus need to gulp down this rubbish down my throat!
As most of the others have stated I too have lost the interest and the addiction I had towards the show as I too feel it has lost the magic it once had and this time it is beyond repair.