The way I see it, Kane is "Evil", but how evil can you be as a Face? As a heal, Kane can do so much more, where as a face, he can't do much to anyone. His heal charecter was always better IMO. So I agree, turn him heal, send him to either RAW or ECW (theres not enough faces on Smackdown) and don't job him out like Snitsky, Khali, Big V, or Henry, cause this guy is a legitimate Big Man. But therein lies the problem. The WWE is using all their Big Heals simply to push the physically smaller faces (Cena, HHH, Batista, etc) with the whole "against the odds" thing, but really, they've ruined it. when was the last time any of the big heals I've mentioned actually won a match that WASN'T against a glorified jobber?
So if they're gonna turn Kane heal, they have to keep him away from Jobbing, he's way better and more deserving than that.