For another Kpop act to reach BTS or BP levels the conditions have to be right. I'll speak about BTS as a fan they had everything going in their favor when they first broke into the western market. The BG market was unfilled and Kpop was still very new and novel to western audiences. BTS did not have to compete with 20 other Kpop groups and that helped.
Kpop where it stands has wore out it's novelty and I think there is just nothing new that Kpop brings to the table anymore to make them stand out. But then again there could be a phenomena that proves me wrong and it just hasn't happened yet. Fifty Fifty was one of those with their Cupid song going viral