It always irks me how many people (or their companies) can afford (them) to be driving around in high class Beemers, Mercs, Audis etc, and they either haven't got Bluetooth (either as standard or retrofitted). Not really any excuse anymore other than "I didn't want to spend the cash". Or worse, I HAVE spent the cash, but I'm too lazy to switch Bluetooth on.
I am seeing more and more people with headphones on in the car, presumably either to listen to music and cut out road noise, or because they're using the headphones with mikes to make calls. Either way, that's also cutting down on situational awareness a bit.
I've got in-dash GPS now (current and last cars) - but they are expensive, and both mine are "2nd user" cars :) I'm quite surprised more manufacturers haven't released/announced Miracast (or other wireless display) capable displays. Got a smartphone? You'll invariably have some form of Nav, so why not just have it sent to the car....?
That would cut down on the cost of providing a car with GPS antennae and systems, the in car nav updates, re-use owners phone tech, get screen mounted tat off the screen/out of view. Even providing a mobile "slot" with an NFC tag to help auto activate Miracast is possible.