> all the small and medium-sized businesses which support the Japanese auto industry will be absolutely gutted when vehicles contain drastically fewer parts.

EVs have lots of the same parts as an ICEV - the differences are engine and power systems, fuel tank, transmission... Most of the car is still there. There is a lot of churn - lead-acid is out, fuel injection, sensors are different and sense different things, and so on, but it's still a car.