I guess you "smart" people never imagine that one or one country can achive an ideology target without caring about loss.
Your smelly of money from your writing approves why China will succeed if she does take action of dumping $. Just because all those bankers are calculating of profit and earnings should some country still in the control by the non-practical yet grand idea of Comm-unism be successful.
Only from economy point of view, just let the 500B go in exchange of a half rated $ might be succeed as half $ can't sustain and may introduce a collapse of a country. This is something your small head can't even start to imagine! You surely assume that half $ can still be the world currency of the world or something.