Soundwave on 22 August 2014
If they had launched a "Super Wii" in say fall 2011 that was a legitimate 600-750 GFLOPS in horsepower with 2GB of RAM (for games, not just the OS) and just a regular controller + say a Wiimote ... I think they legitimately would've had some better success with third parties.
A 2 year window to have the best multi-plats probably would've served Nintendo well, even if the Wii brand was fading, they'd probably be sitting today with about 20+ million install base even on the lower end of the scale.
