...no one in the industry truly believes they have come close to tapping the full potential of any machine.
Developers like to do that before moving on to the next system. Often, the defining games of a system come just before it is overshadowed by its successor. The PS2 favorite "God of War" hit stores just as rumbles about the PlayStation 3 were beginning to build. And smash shooter "Perfect Dark" was released for the N64 when many people were more curious about the forthcoming GameCube.
That's really true, isn't it? I think you can say the same thing about Super Mario World 2: Yoshi's Island; I don't remember it being a big hit at a time when N64 was impending, despite the game being arguably the finest 2D platformer of all time.