When I get into the car I'd want my electronic personal assistant to go ahead and figure out I've got an appointment in half hour and just flash directions on the map. That type of stuff requires deep integration into the cloud platform. It's a tough one to predict what the actual solution we'll end up with. I find it hard to believe that car sales would be driven by compatibility concerns of whatever the cloud platform I'm currently captured by but that just might be the case.
This is sort of what I've been trying to get at.
The conventional thinking is that an automobile must interface with a phone, which in turn provides the interfaces with different services (like Siri, Google search, maps, etc.). I believe that's completely wrong.
How silly or ridiculous would it be if I had to connect my phone to my laptop every time I wanted to use a Google service? Ok, I concede that some people do tether their mobile phones to a notebook computer, but that's just to get access to the Internet (the phone is the "dumb pipe"). I can use a Google service using any Internet connection, whether it's through my computer's built-in cellular modem, WiFi connection at home, or wired Gigabit Ethernet in the office. Even if I have to plug my phone into my car to get data, that should be the only reason to plug the phone in.
If I have reminders on my Google calendar or stored locations on Google maps, all I have to do is have a device logged into my Google account, and that information is seamlessly available to me no matter what the platform. It's irrelevant whether I'm using my Windows notebook, my iPhone, or other device. That "other device" may well be a car in the future. As long as the other device supports connection to and use of the service, I'm good to go.
Apple could theoretically out of vindictiveness try to shut Tesla out of its services, but I doubt that would happen while Tim Cook is CEO. Steve Jobs said he would spend every last penny to take revenge on Google by destroying Android any way he could. Tim Cook basically ended that fight. Apple has historically made services available on other platforms when it helps Apple sell more devices. Bringing iTunes to Windows is probably the most obvious example, because it allowed Windows users to buy music for their iPods from the iTunes store. Right now, Apple's strategy is to make its services appealing by promoting its no-track and respect for privacy (contrast to Google). Would they really want to make their services less appealing by refusing to work with some car manufacturers? Cede the territory to Google, whose software has over 80% of the smartphone market?
This is why I think that whether a car can tap into a Phone and act as a head or monitor for a particular phone is a moot point. It's no longer about the phone. It's about the cloud services.