Nuts, man. Even if he's never convicted, it's a nasty enough accusation that it'll probably stick with him.
Kobe Bryant seems to have come out fine from something he actually did. Being falsely accused is no fun, if that's what this is, but for better or worse, most people just don't care if you're good enough on the court/field/diamond.
What are you basing Kobe's guilt upon? I probably didn't learn enough about the situation to have a strong feeling in either direction, but I don't recall ever thinking "no doubt this is true," and I do genuinely find the issue to be a very serious one (and potentially horrible for either party, depending on the nature and veracity of the accusation).
But, why would we immediately negate the possibility that Rose horribly screwed up? I've always been a big Rose fan, but we don't know the personal lives these guys lead. And as far as Kobe coming out fine, I think it's a safe bet to assume a majority of people believed he was falsely accused. Whether or not that's true, I have no idea... but I'd imagine someone coming out fine after a rape accusation reflects public perception of the incident as much, if not more, than athletic performance.