There are rumours going around, though, that some of the old BW veterans are starting to come over to SC2. There have been multiple pictures from within Korean training houses where certain faces have been blocked out, one or two BW team managers have suggested as much, and ladder accounts with insane win percentages have started appearing here and there.
The BW monopoly on Korean non-pro players has come to an end because there are so many newer games out there that can be equally fun to play for your average casual/competitive player. BW isn't the only decent game around any more, and the pro scene isn't exactly in its prime anymore either. It's only logical that another game would replace BW in PC Bangs eventually.
Question is whether SC2 will be able to take on LoL in this regard.