Everyone who can afford a car with an infotainment system also has a high-end smart phone that they replace several times over the life of the car. It's not quite as bad an idea as putting a tablet in your refrigerator door, but the product lifespan mismatch is of the same nature. To handle the case where the customer would prefer not to think about interfacing their phone or tablet to their car, a branded compatible…
So while I'm fine with having to connect my phone to my car to get useful functionality, I'd like the car to provide something, too. I don't need it to be "smart" in any way, just a big, well-placed dumb screen that displays whatever the phone sends over.
This is already what I do when I drive a car, so I couldn't care less about whatever infotainment system is provided by the car. The only thing I use, because my phone isn't always practical for that, is the radio (as in listening to actual radio broadcasts).