This is an excerpt from the words of Satoru Iwata who spoke with Hobonichi of Earthbound in a recent interview:

Not yet (a success). It’s a good start. It’s been a good start, but it’s only the beginning. We want to have the customers continue playing. We want to continue coming up with new proposals to them, and have them keep playing. Only then can we say that we’ve accomplished our goals. We’ve been preparing to make things happen…We need to see if our new approaches will grab the customer’s hearts, if they will keep on playing our games. The answer’s not out yet, but I believe we’re getting there.

Full Report

With over 11 million units sold worldwide in just 10 months, the Wii seems like a success to me!