No, that is not the target.... at all.... since when is adding a payment method a board/shareholder level decision?
If Bitcoin was just a payment method (which it's not, but I'll get on to that in a second) it would probably go to multiple department heads (finance, legal, customer services) I suspect.
We're talking however of Blizzard taking payments in an unproven, highly volatile currency with limited ability to guarantee they can get their money back out again, or use the currency in any straight forward manner (e.g. to pay staff). Yes, that would probably go to the board if a case could be made for it, and it's difficult to see the advantage to them at this point.
They would have to address the conversions issues. They would put contract in place to handle that, and it would behave just like another payment method to them. If they can't get those in place, they would not accept it. It would never rise to a board level decision, unless some board member became obsessed with it to push it top down instead. It would be dropped if they could not get the contracts for the volumes they want not made a board level issue for a gaming company, too far afield for that to be allowed to become such.