If you`ve got the money, you can do anything on film these days. Nothing is impossible, which becomes boring to me. I used CG as a prop to the story, not the other way around.
If you give the audience what they expect, they`ll be bored. There are no rules: You do what you want while respecting the boundaries. You don`t poke people in the eye; you do things they haven`t seen before and make it accessible, funny and clever.