China's economy looks very different if the world starts treating them differently. All while they're attempting to transition their economy from lowest-cost manufacturer to value-add.
It's benefited from 20 years of optimistic free market access.
No doubt they'll find trading partners, but it's not going to look anything like the open doors they've been used to. And they're going to start finding that their domestic and international choices now have trade consequences, rather than the look-the-other-way, laissez-faire approach the world has taken thus far.