Purvi's sacrifices I am not going to count, those were curses in disguise that she brought upon herself and everyone around her. Good intentions but terrible outcomes. But, someone as innocent as Onir who really doesn't deserve any of this, shouldn't sacrifice.
Or if people would like ArVi to reunite then I think Purvi should make it clear to Onir and just end it herself. Arjun should do the same with Ovi because I think if Ovi gets over Arjun, she has a lot of potential to succeed.
Also to the people thinking Onir or Ovi are the third wheels. Let me tell you that PURVI married Onir, willingly! She put him there instead of Arjun. She brought him into his life. Also, now they are married, therefore ARJUN is the third wheel if you look at it from a "normal" point of view.
As for ArOvi, then no, Arjun was forced to marry her. But, Purvi was the one who blackmailed him into it. And as far as I know, they ARE legally married so still Purvi would be the third wheel not Ovi (at the moment).
Oh and I forgot to mention, for the people saying "Pari needs her parents" I think that there are people in this world who live happily ever after with their step-mother or father. It's not a big deal, also I doubt Onir will ever be bad to her. Infact he would be an amazing father.
Ovi, she cant easily accept Pari but that doesn't mean that she never can. She might be stubborn or selfish as some people say but she is not completely heartless. She loves people to the extreme (a problem). I am just saying...not impossible.