At least the DAZ Originals and PC items seem to be getting converted. I don’t yet know about the PA items.
Actually, I think the older OS X VISE installers had first priority, since Lion wouldn’t run them any more than the OS 9 ones, and most of the products packaged in them were for more current figures, and they showed up first in the store—so were more likely to be purchased. But they do seem to be getting around to the OS 9 ones too. I guess that’s one thing I’ll have to thank Lion for.
Quite a few of the really old items are now delivered in bare runtime folders inside .zip files that you have to install manually. But since you’d have to do that with anything purchased from any other site out there, that ought not to be a hardship.