Sp here's my take. I think since the launch of new show promo, the PH knew off air was high chances. That's why since then KuVan love story was rushed, Bobby Vandu MU was not dragged out. I read somewhere that makers want to give a good ending that's why.
From the beginning unfortunately this show has not been performing well. Star has been rottaing through so many shows in 9pm slot to find a good one that can consistently stay in top 5. The previous show did better TRPs than BKAK and it still went off air in 9 months. I'm surprised BKAK lasted so long - I think it's obly because Rajan has good relationship with Star. Or else high chances of Jhanak launching at 9pm.
From the time new show promo aired, 99% everyone knew BKAK was going off air. Cause no other timeslots are available. 7:30 to 9pm has good shows that are preforming well. And 9:30 to 11pm shows are also good. YHC may be getting 1.4 but it's at 11pm. BKAK is getting 1.7/1.8 at 9pm so chances are less of it performing well at 11pm. For some reason this show didn't get a lot of channel or SM popularity. I think TRP aunties are obsessed with third angles and sautans. I think BKAK would have been better as a web series. All in all, given the TRPs, 7 months was good life span. And makers are 100% planning a decent ending.