Ever since that episode with Juliette as "Eve", it got me attracted to what'll be next.
I wonder if Kelly's powers will be revealed in later episodes. Perhaps almost near the end of the season, he could restore Juliette's humanity. That is if "Eve" snaps or something when it comes to Adalind.
If Kelly does use his powers on Juliette to restore the positive emotions within her and not the negative, maybe Juliette will finally die on a final episode.
But before she slowly dies when she sacrifices herself for both Nick, Adalind & Kelly, she tells that she saw Kelly's future that he'll take Nick's place and that he'll save the world.
In the end... no more Juliette.
It's just a theory.