If the last time we have logged was in 2010, what makes you think he will open his account just to reply to this thread? i have bad news for you, that will not happen because the only way to stay anonymous is to stay away from internet and social networks.
If satoshi will join again to the forum then will be for a critical message, or warn us about bitcoin, but not just to say hi.
Exactly. If he would login just to answer some messages I'd rather think his account was hacked, because it just doesn't make any sense for him to risk own anonymity.