The core unlocking situation may have been an accidental PR goldmine for AMD. When it was first discovered about 1.5 years ago, AMD jumped all over getting ACC removed/altered to prevent core unlocking from becomming mainstream. Within a few months, though, as the knowledge grew and core unlocking possibility became a good enough reason to pick a budget AMD duo/tri core over a budget Intel, AMD grew silent and has let this all ride out. Their reputation has only been helped by this situation. Money can't buy the enthusiast word of mouth cred that unlocking has given AMD (or text-of-finger, if you like)
Since all the Phenom II (and athlon II tri/quads have their own wafter, just not the duos)chips are based on the same quad core wafer, and production quality only goes up over time, one would have to assume that the % of unlockable chips is increasing.
Realizing the value of the PR this situation has given AMD, they have neglected to institute the physical disabling or destruction of the locked cores.