Almost all computers and modern electronic devices depend on embedded software (like Windows) which is licensed. If this ruling stands any license holder of this embedded software could stop or put conditions on the resale of this equipment.
And because modern automobiles contain computers and embedded software, that would include used car sales.
Technically most of them already do. If you want to completely follow your license agreements any used computer you sell should be scrubbed of probably all your software.
Software in cars isn’t licensed, it’s part of the car.
They already do this - Microsoft has conditions on the transfer of the Windows license for computers with OEM copies of Windows, and Apple has conditions on Macs (which essentially have an "OEM" copy of the OS, since you can only run the Mac OS on Apple hardware...)
Tehcnically neither are "embedded", in that they are installed separately from the hardware, and you can remove or overwrite them with another OS.