My prediction...no one will have enough Cinderella (that will be so because this is the one I like best).
I also HATE these short shipments...I have made friends on the pin line, and hate to think I have to get there earlier and earlier every Sat. morning, only to be sure I can deprive my new friends of pins they really want, too. It also seems to me that there are enough pins (except #1), but they are distributed VERY poorly. Usually, if you call around when you get home, and spend $100's on your phone bill, you can find an extra of this here, and an extra of that there, and after you spend an additional $40 per week in shipping, you can wind up with a complete set...
What will happen after December 15th? Will there be a glut at TDS, and will people who bought pins to trade have trouble unloading? I bet Disney will be offering complete sets for purchase!