I don't have the pulse on the Chinese collector market, but all of the people writing about coins in the journals, magazines and other recent numismatic literature seem to be indicating such a boost. Some China-based collectors do seem very interested in Chinese numismatics. The American grading companies are investing in grading centers in East Asia. If they're expanding into Asia, that may say something, right? It might also say something about what they think of their market in North America...
Over the past 100 years/ going by auction results/ realized prices paid for World coins have increased far above inflationary trends. Demand always outstrips supply when you talk about high quality, rare World/US coinage. Keys factors, to success in your investment are buying coins via auctions that are high quality, low mintages, have eye appeal, good pedigree, and are geniune. I feel the coin demand will only keep going higher and higher. I won this FDC Roman Aureus Diocletian 286AD from Triton V in 2002 for $9000US. A lesser quality example sold Ars Classica recently for 5 0000 Swissfrs. This shows that in 14 years this coin appreciated BIG TIME.