Self driving is a side issue. A self driving ICE could be made as easily as a self driving EV.
Consider the following - could you put the same activation and communication system in a Tesla Optimus robot. The robot could then be transferred from car to car, EV or ICE, negating the need to repetitively putting in the control automation in each car.
It can and will be done
The steps are the
Ability to gather information
Robots will need the ability to see the road as well as a current human driver
Process the information
A series of processors as good as the human brain
Evaluate the information
The information is gathered, processed
Make decisions based the prior two steps
Train the processors on what decisions to make
This is what is currently being done as the drive to develop Autonomous Driving is evolving
Tesla has a development path
GM has a development path
Waymo has a development path
Nvidia has a development path
Other Manufacturers around the world have a development path
China has multiple manufacturers on their own development paths
ICE manufacturers are in this process all the way
It is just not touted as much as Tesla
I think we are a long way from having robots handle the process
But someday it will happen