Totally agree with you. Arjun is the main character and astika is meant to be the catalyst that brings about his transformation from arjun to nagarjun. Currently shanks and mohini have taken over as the main villians, and although nikitin has a powerful presence in the show, it is so unfair for all these people saying that the show will not thrive or survive too long without him or that he is the most important character. Please stop undermining all the other actors and characters for your love of one actor as it's very petty and the show does not revolve around astika. All these people are forgetting that there are many other actors who work hard on this show and are hoping that the show shuts shop merely because one actor has walked away.
It was nikitin's decision to quit, nobody forced him, plus he could be a little bit more patient and wait as now the main story is starting but i guess he shouldn't have taken up the show if he felt he wouldn't be able to commit to it. Unfortunately indian audiences are very unpredictable with their choices so shows that deserve trps don't get it which causes makers to make changes that could possibly bring in trps. Changes aren't always a fault of the makers of the show but rather the fault of audience who refuse to watch anything other than stupid saas-bahu shows plus if a show doesn't rake in enough trp's then the channel starts to pressurise production houses causing them to make changes.