I'm sure that Starcraft 2 is still a commercial success. It might not have made as much as WoW yet, but as expansions come out it will definitely is going to make a lot of money. I'm sure they'll also experiment with different monetization models like they are with Diablo 3.
Starcraft 2 is certainly a commercial success, but it will never, ever make as much money as WoW. WoW grosses more than SC2's total sales every five or six months.
