You can already stream HD video from your smartphone to your LCD-equipped stereo receiver unit in you car, the same one that displays videos from your cameras.
Also you can control your smartphone and stereo unit via Bluetooth and voice commands or from steering wheel buttons. Make calls, change the station, get nav maps, or GPS in Google Earth or Gaia GPS all with touch or voice commands.
Aftermarket retrofit buy-in price for all this stuff is about $100 from Walmart and it’s a name-brand label: Pioneer. Add Bluetooth cameras powered by your backup light wiring for about $60.
Look, cars are just going to have all this stuff anyway even if government didn’t make a law to mandate it. It’s cheap, works great, and you can even add it to an older car as easy as adding any old new stereo.
$160 to have all this if you have a smartphone already. Maybe $450 if you don’t have a smartphone. It’s just going to get cheaper.