Although the big selling point of the 3DS is glasses-free 3D, it seems even Nintendo may not be using that trick all the time, according to Satoru Iwata.
Iwata said that "I think there could be a Nintendo 3DS software title which does not use the 3D feature at all, and I believe Nintendo will develop such software." However, Iwata also says "Instead, other features of the Nintendo 3DS should be focused on. It might be a communication feature, or other functions (such as the gyro sensor or the motion sensor). The important thing is that each respective software title has its own characteristics, and appeals to the consumers in a way that fits the software," to reassure users that some unique aspects of the system will be used.
He also stressed the usage of the 3DS's communication features (such as SpotPass and StreetPass), saying "I believe we have to implement new proposals focused on another appealing feature of the Nintendo 3DS, which is the communication feature."
Iwata did emphasize that two of their major upcoming first parties, Super Mario 3D Land and Mario Kart 7, will have a large focus on 3D usage.
Could this be because of cropping issues encountered with the 3D on the 3DS or lack of large popularity? Or maybe Nintendo feels that not every title should use the system's selling point. Plenty of Nintendo first party games hardly emphasized on motion controls to play them.