Where rather than the - necessarily limited - set of predesigned outfit/equipment/face combinations each characters appearance can adjust to what happened to them. Their outfit changes with their commercial status, fights leave scars, having experienced tragedy leaves a haunted look.
Where rather than premodelled dungeons the world shapes around me to tell a story.
Gamedesign would change - and game artists would change from making 3D meshes, textures and animations to being authors of storylines and styles.