Quite sure jump would want mangas that sell 4+ times as much as these manga, so if something promising comes up.. things will be cute. Does one think they are content with 50-70k sellers.
For that to happen, there has to be a new manga that actually sells that much. If the next serialization rounds end up doing as poor as the ones in 2017 (excluding the first one), they'd only lose money by cancelling RxL. Why cancel a manga that sells around 80k when it's not even guaranteed that there will be a manga selling 200-300k within the next 1-2 years?
The last one that sold 200k+ was TPN which started 1.5 years ago. The last one before that was BC which started 1.5 years before TPN, but also needed 2-2.5 years to reach 200k if I remember right.
They'd be better off just continuing the manga until there's a new manga actually selling that much. And tbh, even in that situation they're still better off cancelling new manga that don't sell much.
From the current serialization round, I don't see any manga potentially selling 200k. If Dr. Stone is only selling around 80k after a year, then Noah's Notes might end up doing similarly.