As punishment for what they've been up to over the past few decades of running amok, the DOJ might tell these companies they have to open up app distribution, loosen up on the default payments/messaging/platform services, and allow third party vendors first class software and hardware access that is capable of car automation without needing Apple and Google to "help" (read: dictate and control).

There is no one else with enough market share for any automaker to even begin to think about. They already have what’s needed for those two so implementing a hypothetical standard only wastes time.

The other stuff that could use that interface (video game consoles, etc) don’t need to work while driving or be integrated in any special way. So the existing USB-C or HDMI video standards would be fine since they’d just use the car as a pseudo-TV screen and maybe Internet connection.