Your stupid think SCII shouldnt be on it. SC1 is almost 10 years old and still has thousands of people playing it. Also there are thousands of Diablo II and War3 players that would play it also. Along with all the WoW players that would quit for SCII. When you look at the fanbase for a Blizzard game, its not just the SC community but the whole Blizzard community, most people who own a blizzard game and play it alot own other Blizzard games.
SCII is one of the most anticipated PC games on that list IMO.