Blizzard and unintended consequences

Relmstein has an interesting post about Blizzard and all the "unintended consequences" they seem to run into. He talks mainly about Alterac Valley and Blizzard's recent AFKer battles, as well as the fight against smurfing and selling Arena ratings. Both times, Blizzard implemented fixes that were meant to, well, fix things, but both times, the "fixes" were either completely dodged, or simply lead