Let me say this as plainly as I can:
The Internet is coming to the automobile.
And with it will come audio, video, and new user experiences matched to the medium, beneath the distraction threshold, and appropriate (if not essential) for the place – in a car and on the road.
When the tools of entertainment and information are arm's length away and built into every car, your audience will use them.
The question for you isn't simply being on the menu – it's how you should be on the menu and what you should be serving cross-platform.
"Radio owns the car," we used to say.
It turns out it was only a long-term lease.
Opportunity abounds, but only if we see the world as it is. Not as we wish it to be.