Historically for every dollar of goods we import from Mexico, we export 75 cents to them. Conversely, for every dollar we import from China we have at best a 15 cents export.
Why is everyone chosing China as a place of destination? Because they are undercutting everyone.
Our trade relations are investments in and of themselves. If who we import from never ends up buying anything from us, the relationship should be cut off and sent to someone who will.
When the yuan eventually stands on its own in the global currency markets, the result will not be pretty.
FYI, the last notable country to do this kind of thing was Japan, back in the 1980s. Look at all the complaints about China on this thread, and compare them to all those 1980s doomsday predictions about Japan owning the entire world. Notice the similarity? Does anyone talk about Japan anymore?