On a serious note, I was thinking of re-posting what I said two years ago, since I've done that before.
You can only release more content and market it well, hoping it will catch on.
If I was Iwata, I would just release more titles, and market them just a bit.
Art Academy Wii U
Big Brain University
Endless Ocean 3
A proper Wii Sports U (mash of Go Vacation and Wii Sport Resort)
Since third parties won't release software, do collaborations with them...
Buy a few developement studios, even mobile ones and make new stuff,
even small digital ones that are completely original in the gameplay department.