Not having a final goal mostly means: The Author will randomly add new Arcs, that loosely hang together and probably have plotholes ,as long as the Manga is popular. Totally acceptably in gag-mangas but not in shounen imo.
Right now there is nothing of interest (except seeing some new bankais) going on in the story and I doubt Kubo can pull something off that will be any better than the last arc. But we will see I guess...
-Whale....Lion...? ....no..hmmm...elephant?......fish? ....Mom what do I have again?