World of Warcraft has 12 million subscribers, StarCraft has a massive following and is virtually a national sport in Korea, and Diablo is firmly implanted in PC gamers' memories as one of the best action RPG experiences ever.
So while past performance is no guarantee of future results, it's easy to see why Irvine, CA-headquartered Blizzard is supremely confident that it can continue to deliver with expansions of existing franchises, as well as new IP.
"I think we have a very bright future," Blizzard COO Paul Sams told Gamasutra in a recent interview. "We obviously have Diablo III coming out, which we are very confident in."
"And we're very confident in the other products, supporting products like Warcraft and future expansions there," he said. "And there are future expansions to StarCraft II. Those are real mainstays for us."