Unless you’re suggesting the characters also be CG, in which case I guess that could be tried out but I’m not sure how that would look compared to the rest of the film.
I stated that the recent live-action remake of The Lion King used the Unity game engine to animate 99% of its scenes in the film; in case you didn’t know, the filmmakers made the CGI for the remake look super photorealistic, it looks almost exactly like in real life.