Actually there have been concepts and even prototypes iirc. The benefit would have been to save space when a car is parked in a crowded city, while offering more room when in use. But the added effort for the required mechanic seemed not to be worthwhile.let’s make a folding car! Not that it would help anyone actually use their car, but I bet we could make one. Let’s do this!!
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3D displays suffered from lack of truly 3D movies. Due to cost, film studios preferred a computer-generated 3D version (from a 2D source), so most 3D movies were underwhelming. Plus - some people reported problems with stereoscopic viewing, giving them headaches. Technology probably could've been developed further to minimize these problems, but no-one saw a point really, as there was nearly no (good) content.Remember when the 3D display was trying to become a thing? And it didn't? I feel this is a similar attempt.
After viewing few of the really good 3D movies, I would really love that technology make another attempt to establish itself in the mainstream, as it makes movies so much more immersive! It's like going from mono audio to stereo. Maybe in 10 years ...