Make no mistake, the price will go up if they reach a monopoly level.
They don't really seem to do that. Any industry that the Chinese government points at and decides to dominate, it just happens.
Look at solar. It was expensive as hell and super slow to advance. They decided that they were going to do solar now. They set up a city, offered people an increased basic income to move there, Told the banks to offer extremely favorable loans to companies that were going to make solar/solar components. It's been decades now and the prices haven't increased.
Don't get me wrong, I have a lot of problems with a lot of their humanitarian issues, but when they poked at tesla and said, let's do those next. It's just China doing what China does, and in the end, the worst of it will be putting the west's auto manufacturing out of business. They've ready done it with textiles, plastics and consumer electronics.