I thought of another thing. It's more of a vague idea I'd like to see someday:
RWBY being unable to use their Semblances for some reason. The concept of Semblance-loss was introduced with Mercury's dad and I'd love to see something be done with it. I don't know how since Mercury's dad is dead but it would be so interesting to see RWBY have to fight without their Semblances. Yang was learning how to rely on her Semblance less so maybe it could lead somewhere? Like, maybe Atlas could have tech that can suppress Semblances or something? If Atlas is worried about enemies, they might attempt to create something that stops people from using their Semblances. IDK.
It doesn't have to happen in Volume 7, but I'd like to see it happen sometime in the show.