SC2 is going to become the defacto RTS game for tournaments as soon as it release and you can expect the huge majority of the good RTS players to switch to it...
For those wanting to play on the pro circuit there won't even be a choice. They will have to master SC2...
Sales-wise Starcraft 2 will easy dominate too, even if Halo Wars does well in NA, SC2 will crush it in Asia. Korea is Blizzard's land and Blizzard has started to expand heavilly in China with Wow and will reap the dividends there with SC2...








