It's this simple!!!

According to this ASR/Shaitaan/Beast has by far turned into Arnav/Rajkumar/Prince. So kahani khatam, story is complete. The story was all about him, sorry Sanaya / Khushi, of course we know he couldn't have become a prince without you.

If they want to stretch it out a little more they can show that they are going to / have a baby. That's it, they're already adopting Aarav, he can get a sibling, everyone is happy.

Barun wants to leave, which is fair enough, we have enough respect and love for him. The issue is not him leaving, it's continuing the story without him. It will just spoil what they have all worked so hard for, not only the cast and crew, but I mean 4 Lions, Star Plus everyone.

So it's really that simple, the story has finished when the Shaitaan turned into a Rajkumar. Kahni puri ho gaye hai, toh abb wrap up karne mein kya masla hai?