Just a note, automotive Ethernet PHYs exist [1] and there is some interest in real-time Ethernet applications (piggy-backing on an original audio use case, AVB) [2].
Yeah, BroadR-Reach is currently used by BMW only. There will be more used cases, but I can't talk public about for obvious reasons.
But then, don't expect to have TCP/IP available, like this article suggest.
Yeah, it looks like ethernet, but it isn't. It is not used in cars. Currently, I don't know if it will be used in cars. Presumably not.
Ethercat is used for hardware in the loop simulation.