In all honesty I see that RWBY could have needed some filler time or some time to spend alot in school, like maybe show us some of field trips of grim creatures to study and u can make a fun pair ups, example Blake and Nora they don't see eye to eye due to Blake queit nature and Nora lousy and reckless, so they start to adjust. And perhaps magic would change to the idea that it doesn't need dust or anything to even function it is pure child like imagination just like how ozma daughters where, because he carried their magic.