I'm not sure if you know, but canbus is used all over the place, even in aviation. The main selling point is simplicity of wiring and circuitry, as well as the fact that many lower end / cheap microcontrollers have it built in.
Ethernet is great, don't get me wrong... but it is complex to implement in a system like a car. Each device needs to speak ethernet, be switched and likely have an IP stack. If you are lucky enough to have a built in MAC / PHY into your micro (which most don't), then you still need to put in transformers and protection circuits.
10BASE-T1S is the future IMHO, it is much simpler than traditional 10BASE-T, requires only 1 pair and can also provide power. For simple setups, only 2 resistors + 2 caps are necessary to implement and you can have multiple devices on a bus without requiring a switch.
Ethernet is great, don't get me wrong... but it is complex to implement in a system like a car. Each device needs to speak ethernet, be switched and likely have an IP stack. If you are lucky enough to have a built in MAC / PHY into your micro (which most don't), then you still need to put in transformers and protection circuits.
10BASE-T1S is the future IMHO, it is much simpler than traditional 10BASE-T, requires only 1 pair and can also provide power. For simple setups, only 2 resistors + 2 caps are necessary to implement and you can have multiple devices on a bus without requiring a switch.