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.
Yeah, Satoshi's last seen online here which was in 2010 doesnt necessary mean he's never being here since that time, have you even thought of the possibility of him creating another bitcointalk account with a username that doesnt relate to his personality and joining in everyday discussion here without anyone knowing it him?
Do you know that i can be him? or you can be him? or anyone else in this forum can be him without anybody knowing ?