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I mean. We all agreed on IP, TCP, HTTP, etc. no reason to think we can’t do that again.

those protocols were developed when the internet was much smaller and (mostly) in the control of researchers & technologists. now, we have multi-billion/trillion dollar entities jostling for control over a multi-billion/trillion dollar industry.

how's that for a reason?

I would direct you to the numerous things that _are_ standard on automobiles. For example, CAN bus[1] which is used in almost every single car you'll encounter these days and is what allows their modern electronics to communicate with each other.

The auto industry is fully capable of standardizing on something when it's mutually beneficial for them to do so.

1: https://en.wikipedia.org/wiki/CAN_bus

A lot of things are regulated on the road. This kind of communication protocol could be one of them.

Currently, all cars speak OBD II.