The Chinese are only controlling the mining of the bitcoin. But the miners can also be built by westerners.
Your analogy is far from perfect
The main problem with it is that the Central bank of your country is the only entity which is allowed to issue new money tokens. This basically means if it doesn't do that, then nobody will. And here's the crux of the matter. If Chinese miners choose not to mine any longer, that doesn't in the least mean that no one else will mine bitcoins either. On the contrary, miners around the world will just be happy to mine the bitcoins that the miners from China chose to lose. This is where your analogy fails