Jokeropia said:
The third party situation is quite simple really. As with the DS/PSP initially, almost all publishers bet on the wrong horse and put their biggest franchises on the PS3 instead of the Wii. Nintendo single-handedly changed the direction of the Japanese market and the third parties who didn't realize this got left behind. You snooze, you lose. I'm sure they'll come around eventually.
DS 3rd Party sales were bad, too. It took 2 years to have a top 10 like this:
01. (NDS, Nintendo) Yoshi's Island DS - 131,843 / 434,958
02. (NDS, Bandai-Namco) Word Puzzle Mojipittan DS - 71,701 / NEW
03. (PSP, Capcom) Monster Hunter Portable 2nd - 64,368 / 1,000,599
04. (WII, Nintendo) Wii Sports - 38,560 / 1,204,234
05. (PS2, Koei) Kin-iro no Corda 2 - 34,585 / NEW
06. (NDS, Level 5) Prof. Layton and the Mysterious Village - 31,371 / 297,388
07. (WII, Nintendo) Wii Play - 30,416 / 1,033,044
08. (NDS, Konami) Tokimeki Memorial: Girl's Side 1st Love - 29,033 / NEW
09. (NDS, Banpresto) Super Robot Wars W - 25,139 / 200,759
10. (NDS, Square-Enix) Dragon Quest Monsters Joker - 22,462 / 1,250,726
6x DS => 1x nintendo / 5x 3rd Party