I do not believe any manufacturer will adopt this for existing models. The adoption will most likely require extensive modifications to software and hardware architecture.
It will be interesting to see whether any manufacture adopts this vision at all. It looked more like a CarOS than a CarPlay scenario. Perhaps we will se a partial adoption first, for example showing climate controls on the CarPlay interface and letting Siri control them.
Also, VW has not even adopted the current capabilities of CarPlay. Since iOS 13, it has been possible to show the navigation map in the instrument cluster display. It is something VW could easily do, but they have not - probably to protect their own navigation map, for which this feature is the best selling point.