It's easy to overestimate what people will want in their cars. It's pretty amazing that GPS routing isn't a standard feature on every car. Voice, text and music are the only sure things. A smart phone with bluetooth takes care of the basics, and even now adds GPS.
The "carputer" may actually decline in popularity. iOSX and android put the pieces together more elegantly than any carputer. The trend is in the favor of the small, portable, touch screen OS.
Java was suppose to make hardware a commodity. Now browsers will replace OS. There's truth in this prediction, but it seems there will always be multiple ways of running software.
I run Rhapsody in a browser on Mac. But it's nicer as a win app where it can store music for offline play. When I'm traveling without 3G connection I can't play anything from the cloud.