trade agreements aside we will know when car companies are starting to consider green practices when the wheels from a toyota are the same as that of any other car on the road and the electric motors the connectors and battery packs will be removable have standard mountings and replaceable, swappable between makers and up gradable to new systems as improvements are developed.

. we will then see parts available locally as they will not be proprietary because less parts inventory is important if we are going to take a green pathway forward.. We will then see the automakers reduce their impact on consumer budgets and wasted use of materials You wont be able to get special taillights or headlights as they will be standard off the shelf items. all cars will have bumpers to save accident damage costs. they will all be the same height.

the rest , electric limited lifespan cheapo plastic proprietary cars with new features and designs each year.. its just the car companies extending the time between now and when pollution is taken seriously. If they ever are. No country is pushing for standardization , Russia may be doing the best with the Lada but it's a primitive thing. They did have the right idea.
Ford was making standardized cars at one point with the model T.. Its not like they dont realize the problems they are creating, its all about profits and money driving decisions, money has no conscience,but it makes decisions for us, that's why it's the root of evil ;-)