There is no such scrapped Pixar project that made Henry Selick quit filmmaking. Henry Selick is a renowned stop-motion animator and director known for his iconic works such as "The Nightmare Before Christmas" (1993), "Coraline" (2009), and "James and the Giant Peach" (1996). He has had a successful career in filmmaking, and there's no evidence to suggest that he almost quit due to a canceled Pixar project.