China is rich and can sustain such falls. Speculator will get their hands burn. Nobody can fight USD 3.55 trillion. Not even EU and US national reserve combine. Gerorge Soro learn a hard lesson not to mess with CCP. The fall in stock market is just an adjustment. Further fall is not expected.
No body is rich enough to continuously sustain out flows.
The calculus is very simple. A country has a particular exchange rate with respect to other countries. The exchange rate is set by currency movements in/out of the country, so that the net exchange of the currency is at equillibrium.
China and other countries have deliberately hoarded up foreign exchanges so as to devalue their currency, or prevent it from rising, and to get some control over exchange rates.
But right now, confidence is weak in Chinese economy for many people. A lot of people are withdrawing money, both foreigners and Chinese. And when yuan is sent out from China, and if there is excess of yuan being converted to dollar, either the exchange rate must weaken yuan, or China will have to intervene in its markets by buying up its own currency using FX reserves.
China is doing the latter to promote consumption, living standards, and get RMB recognition as a reserve currency.
But, that is where I think Chinese policy makers overplayed their hands.
Right now, China should not focus on reserve currency status, but more on growth by all means.
The USD became the reserve currency only after 4 decades of surpassing the British Empire as the biggest economy. Reserve Currency status needs confidence, and established institutional frameworks, plus some geopolitical hedge.
China should have seriously thought of reserve status only after having overtaken the US economy, and having done so 10 years back.