There is a not-insignificant group of people who would kill for more Stadium minigames.Minigames
But you see people in this thread disappointed that there isn't more of a focus on battles in the games that currently exist, this could be where that comes from.
The problem is that the overlap of casual minigames and competitive battle game doesn't make a ton of sense. It worked for the original Stadiums because it was our first foray into 3D.