I'm skeptical about that. How high would interest rates have to be to justify an investment where you get paid off with Monopoly money?
Wouldn't they get an even greater return than those high interest rates if they invest in hard assets instead? Valued in dollars, the price of gold, oil, etc will go up significantly as the dollar shrinks.
The hard truth is if the Chinese ever withdrew enough assets from us to destabilize our economy we'd have to quit buying all that stuff they make, which would tank their economy. They're trapped.