Perhaps I misunderstood the proposal.
I thought the proposal was to have the car run on iOS not integrate with it.
I don't think running IOS is necessary or a good idea.
I like the dash, and don't want a bunch of app and stuff running on it. But it really needs to fill in the missing features. A navigation system (at bare minimum add favorites/home), better media player (rearrange favorites, support play lists, shuffle, correct album art, iOS/Andriod integration) and a better browser (at a bare minimum add location support) would be great.
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Read the post immediately preceding yours. There's a huge difference between integration and base platform.
"
iOS in the car." does not mean the car is controlled by or running iOS. Just the the car can control an IOS device via there touch screen and data from the phone can be displayed on the car's touch screen. (see http://en.wikipedia.org/wiki/IOS_in_the_Car)
In the Model S, one of the two windows could control the iOS Device and play music, read texts/email to you, look up a date in your calendar, display navigation data, etc.