i dun think its happening in korea, i take this as a surprise. cuz according to my korean friends in college, brood war is still a big deal. more than 400k ppl still playing IIRC....while ppl playing sc2 are lesser than wow or some FPS games...

i guess it will be the same when DotA 2 come out, only a partial will change to dota 2, and majority will still go for the 'free' dota. even HoN and LoL with free game play, ppl are still sticking with dota...