Why couldn't Juliette just die?
Any sane person wouldn't accept she became a monster and go crazy but Juliette was wayyyyy to crazy that I was actually glad she died.
Besides, do we really need Juliette? Any strong wesen who sided with Meisner would have been just fine.
Why does Nick and the story have drag on Juliette?
Well, Adalind did became boring that she is just a helpless house mom not the strong, confident hexenbiest and maybe they needed a strong woman since Rosalie only works as a sidekick and Trubel is more of neutral than female.
But WHY does it have to be Juliette?