I have seen what people are developing. Besides, cars do not need to have micro electronics.

http://reprap.org/wiki/MetalicaRap

http://medtechinsider.com/archives/24967

http://www.nthdegreetech.com/printed-semiconductors.php

That said, there will always be some things for which economies of scale win out against customisation, and I suspect that many electronics components are in that bracket. Luckily we have things like FPGAs, so you don't need to keep a huge stock of specialised chips to make a wide variety of devices.