My learning of this news parallels to the movie actors' faces in this scene:
|Wait, what? I'm confused|
If they keep actors, I'd keep Lily (Clary), Robert (Simon), Jemima (Isabelle), and Lena (Jocelyn). Everyone else needs a recast in my opinion. I'm guessing they'd do a book per season? Would they be starting with City of Ashes or start from the beginning? I think it makes more sense to start at the beginning. I hope they don't deviate from the book as much. That'll kill me!! I do tend to like TV shows because it gives you ample time to develop the story while movies tend to be rushed and they cut out some things you wish they hadn't.