Hi. I think older pieces - meaning pre 1945 - have got to be worth collecting, especially the rarer facetted pansy and nosegay designs and similar, and the more detailed millefiori ones. Also Chinese whites, of course. And aquarium weights. At some point Chinese collectors will get into the market for the rarer, early pieces. I doubt that the ones that have appeared in vast numbers in the last 25 years will attract much interest...but who knows?