ekta broke anupre in kzk1 because anurag did something to prerna which was irredeemable. same is the case here, karan's actions are beyond redeemable.
i dont remember any other male lead who did such things in any other ekta's show. raman and abhi were arrogant but their level no where matches karan.
i dont think makers are doing this to karan's character without any purpose and everything will be settled by just a casual sorry. also when sarla is consistently shown cursing karan.
plus this show was always promoted to be a love triangle. rishabh was on the montage for two whole years. they changed it after preeran marriage. it does not mean it got scrapped. it is just that keeping triangle montage with brother-in-law was sort of unethical.
Yug and vrinda are an example of ekta couple who never married and never got together (they were the lead couple in tujh sang preet pagayi sajna on star plus), where even in the end they were never together, and the male lead forever loved her, and he didn't ever do anything irredeemable to the female lead. No wonder the show shut not too long after pairing the leads with other not so appealing and interesting actors/ characters.