Talking with Adam Reuters, Fils-Aime made the following comments:
“We think the ability to customize your Mii is very fascinating, adding more personality, more information, so certainly that’s something we’re looking at. We have had so much interest from a variety of virtual networks out there. We have Miis showing up on MySpace, and other places."
If Nintendo do start to release online games for the Wii it will be cool to be able to use your Mii as an online character and certainly a more fun feature than XBOX Lives somewhat needless GamerCard.
Reggie also went on to talk about MMORPG's on the Wii:
“The Wii certainly has enough power to drive an MMO and make it totally interactive. Are we as a first party looking at it? Not so far, but are we encouraging other developers to look into this? Absolutely. We believe with the nunchuck and the Wii remote it could be a fantastic MMO.”
So here's an idea then Nintendo - build an MMORPG (like Phantasy Star Online) with the main characters being Mii's. Sounds sweet to me.