Nintendo Network ID Stuck on Wii U Consoles
Nintendo has stated that for now, Nintendo Network user account can only be used on the originating console.
On Nintendo’s support site, a post was published, in which they revealed that there is no current method of signing into your Nintendo Network ID onto another Wii U console. That means you would have to start a new account if your console were to break for any reason.
However all is not lost, as Nintendo also stated that, “In the future, you will be able to use your Nintendo Network Account with future Nintendo consoles and other devices, such as PC’s.”
Until they, I would take special care to ensure your console is protected from damage. I would hate to have all my progress lost prior to this update.
Nintendo has already stated their intention to bring the Nintendo Network over to the 3DS. Perhaps this update will come at the same time.