My guess on, why the Anu-Moloy scene and Anu getting scared of dying before time were included is, firstly to make Anu realise how fast he has to act w.r.to disentangling Pre from the chains of hatred & bitternes and secondly because, Moloy is going to die. We got Komo already hinting on it and the reason why it might happen, is because, that is how the universe is going to serve many people's Karma in one go. 
1. The unstoppable Komo has to make this mistake thaaki finally she herself has to dig her own grave and loose everything. 
2. Mohini has to face something like this at the hands of Komo, for all the karmas that have been awaiting her from the last 8years.
3. Anu too has to face the pain of loosing his loved one forever, for the way he acted against Durga maa's wish and pushed Pre & Sneha away from him, while the truth of his intentions has got him his Baba's blessings as 'Meri umar bhi tuje lag jaaye'.
4. Pre has to get a major shock for not having trusted her soulmate and what else than her KakaBabu's demise can bring that much needed jolt to her.
5. Moloy himself has to face his Karma for not standing by Prerna and his friend's family when they needed help and it will be served in a way that he will not be there to enjoy the happy moments of his son and family. 
If this is happening, it is going to be a really heartbreaking moment for AnuPre and I hope at least this time CVs will not disappoint us.