Apple is spearheading the correct approach with iOS 7 where it basically takes over the in-car A/V and Apple has done all the work on UI to work flawlessly with their mobile platform.
All the automakers need to do is supply hardware with basic functions and an open platform that allows the user to use the system of their choosing. I've been saying this for a loooooong time.
Edit: Hmm, I should've read more in detail. I'm more or less just repeating everything already posted.
2011 SES 5spd #006 >> SR #213
What other people think of me is none of my business.