This has been Nintendo since practically forever, they have always been railed on for their sub-par hardware milking it for as long as possible. Wii U might not be selling hotcakes but I don't think this is Nintendo's death. Their IP will keep the company going.
For anyone interested in the story of Nintendo (or just enjoys gaming history in general) this is a fun read: http://www.amazon.com/Super-Mario-Nintendo-Conquered-America... (or listen for commute/jogging)
I just finished the audio version during workouts, while it was not _thrilling_ it was definitely interesting
I mention it because I think there's a lot of value looking at the "no longer promising" areas and see what can still be done with those tools and pieces in innovative ways. And so few are actually doing that.