Pretty much guessed this yeah.
That's a hell of a gamble though to hope to repeat a pop phenom though, especially when the previous two systems by Nintendo were clobbered because of no third party support.
Nintendo had the best selling games of that generation. The fact that Nintendo never got third party support even with Gamecube is enough to tell you why they don't trust third party developers.
Nintendo Published Wii releases:
2006
Wii Sports
Excite Truck
The Legend of Zelda: Twilight Princess
2007
WarioWare: Smooth Moves
Wii Play
Super Paper Mario
Mario Party 8
Big Brain Academy: Wii Degree
Pokémon Battle Revolution
Mario Strikers Charged
Metroid Prime 3: Corruption
Donkey Kong Barrel Blast
Battalion Wars 2
Fire Emblem: Radiant Dawn
Super Mario Galaxy
Link's Crossbow Training
Wing Island (Europe and Australia only)
Mario & Sonic at the Olympic Games (Published by Nintendo in Japan only)
Eyeshield 21: The Field's Greatest Warriors (Japan only)
Harvest Moon: Magical Melody (Australia only)
Resident Evil: The Umbrella Chronicles (Australia only)
Zack & Wiki: Quest for Barbaros' Treasure (Australia only)
2008
Endless Ocean
Super Smash Bros. Brawl
Mario Kart Wii
Wii Fit
Wario Land: Shake It!
Wii Music
Animal Crossing: City Folk
Wii Chess (Europe only)
Disaster: Day of Crisis (Japan, Europe and Australia only)
Mario Super Sluggers (Japan and North America only)'
Zero: Tsukihami no Kamen (Japan only)
Captain Rainbow (Japan only)
Common sense of people power TV (Japan only)
Naruto: Clash of Ninja Revolution (Australia and Europe only)
2009
New Play Control! Mario Power Tennis
New Play Control! Pikmin
New Play Control! Donkey Kong Jungle Beat
Punch-Out!!
Wii Sports Resort
Metroid Prime: Trilogy
Wii Fit Plus
New Super Mario Bros. Wii
Another Code: R – A Journey into Lost Memories (Japan and Europe only)
Mario & Sonic at the Olympic Winter Games (Published by Nintendo in Japan only)
Excitebots: Trick Racing (North America only)
New Play Control! Chibi Robo (Japan only)
Takt of Magic (Japan only)
NHK Kōhaku Quiz Gassen (Japan only)
Harvest Moon: Tree of Tranquility (Australia only)
2010
Endless Ocean 2: Adventures of the Deep
Sin & Punishment: Star Successor
Super Mario Galaxy 2
Monster Hunter Tri (Australia Only)
Samurai Warriors 3 (Published by Nintendo outside of Japan)
PokéPark Wii: Pikachu's Adventure
Metroid: Other M
Tetris Party Deluxe (Australia Only)
Wii Party
Kirby's Epic Yarn
FlingSmash
Donkey Kong Country Returns
Super Mario All-Stars 25th Anniversary Edition
Zangeki no Reginleiv (Japan only)
2011
Mario Sports Mix
Wii Play: Motion
Pandora's Tower (Japan and PAL only)
Mystery Case Files: The Malgrave Incident
Kirby's Return to Dream Land
The Legend of Zelda: Skyward Sword
Mario & Sonic at the London 2012 Olympic Games (Published by Nintendo in Japan only)
Fortune Street
2012
Rhythm Heaven Fever
PokéPark 2: Wonders Beyond
Mario Party 9
Kiki Trick (Japan only)[17]
Xenoblade Chronicles
Project Zero II: Wii Edition (Published by Nintendo in Japan, Australia and Europe only)
The Last Story (Published by Nintendo in Japan and Europe)
New Play Control! Pikmin 2
Inazuma Eleven Strikers (Published by Nintendo in Europe only)
Just Dance Wii 2 (Japan only)
Kirby's Dream Collection
Kirby's Dream Collection: Special Edition
Pretty powerful list. Nintendo just needs to bring back old IPs to the start of the gen (Pikmin, and hopefully Metroid) and maybe a new one somewhere and they'll be on their way to fixing those end of gen issues (with better forward planning too).