With the maturation of additive manufacture (for more structural plastics and metals using laser sintering and electron beam melting) parts for autos (and other appliances) will become practical and economic. I predict the rebirth of a "Volkswagen Beetle"-like car which will be simple mechanically (esp. due to simplicity of electric drivetrains), generic and open battery (probably sodium salt vs. lithium) and electronics tech, and modular design that enables affordable interior and exterior upgrades w/o need to replace the frame.