Thats the problem that Nintendo faces now though. Increase cost of software development but less overall sales on the platform. Whats the give point? I dont pretend to understand what that would be, but it is a very real worry for Nintendo in their strongest market.
Wii U is basically a repeat of that, but with Japanese-styled games (TW101, Nintendo Land, Wind Waker, Super Mario Cat World, Pikmin) instead of 3D games (with the exception of 3D World, obviously) and mostly unexciting redux versions of software from Wii/3DS instead of software from DS.