It seems to me that stereoscopic 3D is as much as "novelty" as is color. It's an objective improvement, because we perceive the real world in stereoscopic 3D. Of course the hardware implementation (not so much on the New 3DS) has various downsides, unlike color.
I don't think color is that different. E.g. older computers had limited color palettes, like 16 color EGA.