Earlier quoted context omitted.
I guess you could vote with your wallet by buying from a leading competitor instead. It won't hurt them directly, but market position matters to them. They will probably notice it about as much as one lost sale :(
Boycott Blizzard and tell all your friends to do the same.
I think we both have been, for a while, simply because their games were not for us anymore. The post I responded to was asking what to do when we already don't buy, a boycott won't be felt.
Though anyone planning to boycott would best keep in mind not to forget about anything labelled Activision too.