I'm not even sure if 128MB is a common setup for most PPC cards out there, my CS PPC had 64MB (4x16MB modules) afair.There are definitely way more BlizzardPPC cards than there are CSPPC ones. Not sure how many are still operational, though. This hardware is definitely no indicator how well MorphOS 2.x performs on supported Apple hardware for sure.
This discussion is all rather moot, anyway. The situation hasn't changed much recently regarding release of an updated MorphOS version for Classic machines. IMHO, the impact of it in 2011 would definitely be too little, too late. If anyone with BPPC/CSPPC following the post C= era hasn't shown any kind of interest for MorphOS so far, he/she probably never will.