Activision has nothing to do with Blizzard. They are just two companies owned by the same parent company.
What you want is Activision-Blizzard. The corporation that owns both Activision and Blizzard and King and MLG.
But separating from Activision-Blizzard is never going to happen, because like I said Acti-Blizz owns Blizzard. Lock Stock and Barrel. The only way it could happen is if you coughed up a few billion dollars and offered to buy Blizzard and Acti-Blizz were willing to sell.