If the non asian was pretty enough I could see a label giving it a shot. Talent wouldn't be enough I don't think :( Also maybe the indie-esque scene would be better after all they have that non-asian drummer in Busker Busker. They are kpop but not exactly "idols."
If Japan can embrace non-asians I don't see why Korea wouldn't. Not saying it would be successful but you never know....let people have their dreams. I just hope they aren't expecting to make a lot of money.