I accept it but as the entire market shifts to tablets, I doubt it'll be sustainable for Nintendo.
Really the lack of 3rd party support, imo, was worse with the GC. While it did get good support from Ubisoft/EA my son still needed to get a PS2 to play a lot of great games - even when direct ports where simply done.
Wii actually, mathematically if you will, had monstrous 3rd party support. Just not in the form people on these forums appreciate. I own a ton of 3rd party titles for Wii from Lego, Guitar Hero, Just Dance to Dewy's Adventure, Let's Tap, Boom Blox to Fishing Resort, Driver San Francisco and Prince of Persia Forgotten Sands. All games that sold best on Wii or were unique to Wii and used it's strength.
While I was always hoping for GTA III Trilogy to be ported to Wii, I don't miss the Mass Effects, Assassin's Creeds, Uncharted, etc as those were all designed for more powerful systems and a Wii version would just be plain inferior (and sell like crap) unless it was some sort of spin-off designed around the Wii's strength (which also sold like crap, no matter how good they were).
But Wii had the 3rd party support I was looking for for what Wii was (minus the shovelware)
WiiU at the moment has good support but I fear it's support will be weakest of all as most of smaller developers and 2nd teams of larger developers will focus on tablets which are cheaper to develop for and have a much larger user base - IE: greater ROI. The Wii effect now working against Nintendo.
Core gamers and core games will continue to the more powerful system which will be 720/PS4/PC/Steam Box?
The only reason to own a WiiU (IMO) is for HD Nintendo games.