I think I'd rather see cars made from more wood than carbon fiber. As stated by others, the sharply reduced usefulness of recycled CF is part of the reason. There's less entrained energy in a part made from wood, and you can engineer wooden members with known, predictable strengths and yields.
It wouldn't shatter as abruptly as CF when it fails, either. I think it's completely within the scope of existing technology to engineer wooden structural chassis members that can contribute to predictable crash force dissipation.
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