I could see New Super Mario Bros. Mii becoming a real game. And Battle Mii and Find Mii plus others together is a "Mii Collection" of sort. Maybe bundled with the console, even.
NSMB Mii will become a game. I would be amazed if it didn't, though I believe it will get a slight graphical improvement over the above screen.
Battle Mii and Chase Mii should become two pieces of a larger collection of minigames that comes with the system. Period. The system would sell less without such a collection. Games like that have the potential to be components of the Wii Sports of this next generation, and they should follow the same rules they used for that.