Eh... a few years ago I would have agreed with you but based on their recent releases and the kinds of statements their designers make I get the distinct impression that whatever magic Blizzard had that allowed them to make games like Warcraft 1/2/3/Frozen Throne, WoW (Vanilla and BC), Broodwar, and Diablo 1/2 has faded. Most of the original key people responsible for those games are no longer there and Blizz seems to be favoring a blander mass market approach.
Blizzard has Mac OS support, I don't see it being too much work for Linux native. The main problem is the massive amount of Linux distros. But they could support ubuntu and their offsets fairly easily.
I wonder how much Sam Lantinga is responsible for the existence. As far as I know he joined Blizzard after coming off of porting games to Linux at Loki Software. Interestingly, he's now at Valve.
