You make it sound like Nintendo's studios can't make more than one game at a time. And what have most of Nintendo's studios even released over the last year that would prevent them from being ready for a Wii2 near the end of 2011 (with a more likely release date of early 2012 now that 3DS has been delayed)?
I'm sure Retro is working on more than just Donkey Kong.
Who made Kirby? what else are they working on?
SMG2 is done and Pikmin 3 is being worked on, but what else is this studio working on?
WiiParty.... probably not a studio encompassing project.
Zelda Wii.... when does that come out again?
Xenoblade is done, what else are they working on?
Nintendo has plenty of studios that I'm sure we haven't seen anything from in quite a while, what are they all up to?
Here's a list of all of Nintendo first and second party studio's that actually developed games for the Wii are currently up to and what they've recently done. I'm leaving out the studio's that only made games for the DS since I doubt Nintendo's going to suddenly have them start working on HD games when they weren't even making normal Wii games.
EAD 1 - Currently working on Mario Kart 3DS and Nintendogs + Cats. Last game released was Mario Kart Wii over 2.5 years ago and before that was Mario Kart DS released 5 years ago.
EAD 2 - Currently working on Animal Crossing 3DS and Pilotwings Resort. Last game released was Wii Sports Resort over a year ago, and before that was Animal Crossing Wii and Wii Music 2 years ago.
EAD 3 - Currently working on Skyward Sword and Ocarina of Time remake. Last handheld Zelda was release almost 1 year ago but last home console Zelda was released 4 years ago.
EAD 4 - Currently rumored to be working on Pikmin 3 for the Wii since they did the New Play Control Pikmin ports. Last game released was New Super Mario Bros Wii which was 1 year ago and before that was Big Brain Academy: Wii Degree over 3 years ago.
EAD 5 - Current development unknown. Last released game was Wii Fit Plus a little over a year ago and before that was Wii Fit almost 3 years ago in Japan.
Tokyo EAD - Current project unknown. Last game was Mario Galaxy 2 released 6 months ago and before that was Mario Galaxy released 3 years ago.
Intelligent Systems - Currently working on Paper Mario 3DS. Last game released was Fire Emblem: Mystery of the Emblem remake for the DS 4 months ago in Japan. Last home console game though was Fire Emblem: Radiant Dawn released over 3 years ago.
Monolith Soft - Current game unknown. Last game was Xenoblade released 5 months ago in Japan, and before that was Disaster released 2 years ago.
Retro Studios - Currently working on Donkey Kong Country Returns which comes out in almost a week. Last game before that was Metroid Prime 3 which was released 3 years ago.
Nd Cube - Just recently released Wii Party, can't find much on any of their previous games except for F-Zero Maximum Velocity for the GBA in 2001 and Tube Slider for the Gamecube in 2003. Of course Nintendo just bought the entire company and recently turned it into a first party studio so I imagine it'll be getting more productive soon.
Creatures Inc - Current project unknown. Recently released Pokemon Ranger: Guardian Signs for the DS and released PokePark Wii: Pikachu's Adventure for the Wii a year ago in Japan which was their first home console game since the canceled EarthBound 64.
Camelot - Recently released Golden Sun: Dark Dawn for the DS but they did make We Love Golf for Capcom on the Wii which was released almost 3 years ago.
Genius Sonority - Currently working on a Pokemon typing game for the DS. Last Wii game to be released was Pokemon Battle Revolution in late 2006 and Dragon Quest Swords back in 2007 where they help assist Eighting in development.
Good Feel - Just released Kirby's Epic Yarn and before that was Wario Land Shake back in 2008.
Monster Games - Current Project unknown. Last game released was Exitebots over 1.5 years ago and before that was Exite Trucks back in late 2006.
Next Level Games - Recently worked on several Wii titles, last one for Nintendo themselves was Punch-Out!! over 1.5 years ago and Mario Strikers Charged over 3 years ago.
Paon - Recent game unknown. Last game was the Klonoa remake for the Wii which was released 2 years ago in Japan and before that was DK: Barrel Blast over 3 years.
Skip - Recent game unknown. Last game was a Chibi Robo for the DS over a year ago that has stayed Japan only and for the Wii Captain Rainbow released over 2 years ago.
Based on the recent development history of all these studios, I just don't see how most of them could realistically have anything ready for a late 2011 or early 2012 launch. Not to mention the studio's that haven't released any Wii games lately are mostly the lesser ones like Paon and Skip which point to them probably releasing normal Wii games in 2011 to help give the Wii some more support for 2011/early 2012 since Nintendo would not launch a new system on the backs of these developers.