Why won't the car companies let us recycle?

It would be way more labor intensive to take everything apart down to the bare (rusting) car body and the rebuild with all new parts. Also it would create WAY more pollution to forge the MILLIONS of parts they would need to update the countless number of models on the road to day. Think of how many new parts they would have to make to accommodate all the different years. Someone else might want a new car (or should I say , SAME OLD CAR) in 19 years or 8 years or ?). When most people buy a new car they want something different and newer looking not just their same old rebuilt car. It's much easier and cost effective to just melt down the old body and start over. I doubt there would ever be plans to do this. Technology keeps advancing and you can't make a mountain out of a mole hill ( make a squared off 1980's style car aerodynamic by today's standards, not going to happen).