Ironically I am very happy to hear that Sidhant is trying to leave the show. The TOI mentions that "maybe" he'll be quitting. I think the production will ask him to stay for one more month until his contract expires by end of June or beginning of July.
Currently there are two tracks that the show has on going. Twinkle-Kunj reunion probed by the family, and Anita trying to kill Twinkle after the union that will force Yuvi to tell Surjeet about her. I think one month is a good enough time for the two tracks to run and TEI ending on a happy and high note.
I would rather the show ends at a high note with the promised happy endings then drag on like bubblegum and lose its essence. TEI typically takes two weeks at max in every track so these track can be properly paced without rushing through.
Personally o was already planning on quitting the show after the reunion and SR because there's not much to the story left after Kunj and Twinkles Union. The main point of the story was Twinkles journey of finding true love and settling down and with the union that will be accomplished. I think Sodhant leaving can really help in the show closing down at the right moment with much fan fare. It'll also mark a successful run of almost a year and Zee TV's first show being successful in right means.
I would urge the people trending to try to get the show end at a positive note rather then retain Sodhant as Kunj because Sidhant as an actor deserves better then what Tashan e Ishq has offered him besides visibility.