They could, but they’ll wait, they’re not ready yet. Until then, they’ll continue to electrify their economy, build out domestic energy supply, rebuild their oil inventories from Russia and Iran when able (at below market prices, dominated in yuan, avoiding dollar systems and sanctions) and prepare to take Taiwan as the US continues to weaken itself.
If Taiwan toasts TSMC when that happens, well, that’s part of what China is rapidly building out their domestic chip industry. China will then have a monopoly on that chip production besides what can be produced in the US and Europe, and have achieved reunification. And who is going to stop them? Nobody, based on the evidence and current trajectories.