I agree. China’s being underestimated, especially with their steady infiltration of immigrants into resource-rich Russia, a nation whose ethnic Russian population is dying. I wouldn’t be surprised if, by the end of the century, China ends up buying the Eastern half of Russia. That would end a lot of raw-materials dependency.
I think a collapse of the USA would do short-term damage to China, but they would adapt.
Be interesting to see what the global dynamics in year 2100 will look like :)