Nintendo understands what made the Wii successful, but those conditions can't be replicated in 2014.
It's like asking an artist who has a hit record to constantly make new hit records by simply following the same formula. It doesn't work that way for everyone, pop culture crazes like the Wii are a product of being the right thing at the right time. They are partly a product of the moment, just like Guitar Hero was the hottest brand in gaming for a couple of years.
The Wii was great for what it was but its time has come and gone. In some way the Wii U flopping so hard so quickly may be a blessing to Nintendo because it liberates them from having to keep following that dated legacy. Their next hardware can have its own identity and ideas and doesn't have to beholden to certain "Wii formulas" (ie: the lead game must be a mini-game casual collection).
Nintendo is historically a company that clings too much to the past and embraces the future too slowly.
