[GMcL]

It's good to think about these things but not over think them.
We are in the middle of a massive shake up in terms of tech and even the cars themselves and how they interact within the environment.
Can you imagine a world without the internet ? Give it another couple of years and 'the internet' will not exist, it will just be there like sewers, water/gas/electric mains, telephone lines. Yes it will have to be maintained but it will be nothing of special note, just another utility.

Mirroring will allow you to do things Apple and Alphabet have not yet thought about. Write your own app and off you go. If it can be monitized the big boys won't be far away, they always follow the money.