Not sure if 3D games would have the ability to be turned off, but I would assume they could. It seems Nintendo likes the idea of making anything that could alter battery life into something that can be changed (sound, light levels). I believe multiple screens or displays or however they planned on doing the 3D would qualify under that.
In any case, the system itself would definitely have the ability to play 2D games. It's just whether the games had the ability to have the 3D turned off.
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