Board Thread:Speculation House/@comment-14138255-20141017020106/@comment-10380701-20141020043101

The only way I can see the Grimm being wiped out is if they pull the source out of its roots. Namely, the Mother Grimm herself.

Then again, maybe the Grimm won't disappear, they'll just lose their main purpose and become something akin to random encounters in future seasons. They still mostly cover the earth, but they aren't all over the kill humanity thing.

Alternately, the Grimm CANNOT be stopped. Only hindered. Once in a while, RWBY will kill a super Grimm that looks like it could be the Mother Grimm, but was just an agent for her. Like Cinder or something. Makes for an arc cut off point actually.