In DB Super chapter number 48, Cranberry has killed Moori but Polunga has continued to exists.
After he granted the 3 wishes, the seven dragon balls scattered all around the world, just like always.
Many people say it's because Moori transferred his powers to Esca but there is no statement that can prove this.
But let's assume that this is true: it is logical to transfer the powers to a helpless and weak kid considering that some evil guys are seeking for dragon balls?
Temporary self destruction of dragon balls would have been the best solution I think, in order to prevent that evil guys that to state their wishes, even more now they know the existence of Shenron and Super Shenron .