Except ArVi fans, everybody else have accepted Ovi and Onir as lead characters, so I don't think CV's gonna risk it by terminating their characters.
Concerning for Ovi, maybe Arjun has started realizing Ovi's importance in his life. His guilt for hurting Ovi is eating him from inside.Yea people can still say that since he is feeling guilty doesn't mean that he loves Ovi but I think practically speaking, one should not expect Arjun-Ovi's love to bloom as similar as it did with Arjun-Purvi...It will be a little different, a little steady, a little mature in nature. By mature I mean even though he still have regards for Purvi and Pari, his true happiness lies with Ovi.
Arjun must try to prove Ovi that even after such up and down, he can be the man worthy of Ovi's love. I guess in this we'll get to some shades of both these characters