Ni no Kuni is going to need some significant changes if L5 wants it to be a major player in the RPG space, especially in the west. Every RPG brand that's popular in the west has been laser-focused on what it's good at, and found its own niche. Just off the top of my head:
Final Fantasy - High production values, Nomura art, drama
Persona - Immersive escapism, high school simulator, waifus
Xenoblade - Large, alien worlds and a sense of adventure
Fire Emblem - Approachable strategy-based gameplay, character relationships
Tales - Anime comfort food with good combat
By comparison, I couldn't tell you one thing Ni no Kuni is known to excel at. The "it looks like a Ghibli film" thing was impressive back in 2009, but it isn't any more. They really need to figure out what Ni no Kuni stands for, what kind of audience they're aiming at, and then hire talent specifically around those goals to make the next game.