BW is still much bigger than SC2 in Korea or?
What do you mean, "still"? It was never smaller and the gap has been widening for a long time now.
Also, didn't realize there was a thread here for ASL2. Pretty awesome.
Don't know about a documentary, but its because blizzard prevented Korea from running the stuff themselves like they did for SC1. Blizzard basically mandated everything.
What are you saying? BW had that for a long time, sure. But Blizzard sued Kespa back then to kill off BW to make way for Starcraft 2, essentially forcing the game in.
SC2 is a very different game from Broodwar. Unless you played terran, your race was changed almost completely, and even then the tactics you have to employ have changed dramatically. So it's off putting to the old pros from the start. I don't think it's nearly as good as a spectator sport despite the improved graphics, and the skill level required to be competitive is insanely high. SC2 just asks too much of a pro player, while it didn't have much of a casual appeal to get that big fanbase in Korea.
Graphics are debatable. I, for instance, dislike Starcraft 2's graphics, as it isn't nearly as clear as those of BW. As for your last sentence, that doesn't make any sense. BW has a much higher skill ceiling while SC2 made a lot of things easier (auto-mining, smart-casting etc but also removing essential units such as vultures, reavers and lurkers). BW was also THE competitive sports in Korea, not even LoL comes close. So despite having such a high skill ceiling, people still watched and played (age and gender didn't matter) the game.