As for the fall of it? I think it will be related to the minerals that are just limited for the battery creation. But that might take time as China has got a lot of friends if it's about these natural resources needed in producing these BYD and other chinese brand of cars. Tariffs will certainly impact that a lot but they don't care about for the likes of US, they won't just go into their market unless there's a strong demand there. I am seeing this brand of car in the road everyday and it's got a strong sales here in the Philippines. But if God blesses me with some extra money I am not yet sure if this is the kind of car that I'll purchase.
China is the leader in many minerals that are needed in battery creation and leader in their processing, I am sure they are better positioned that any other country.
You can observe their power when they threaten to limit rare metal exports, the west gets quite spooked.