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.
Am i feel bad to tell you that one can still stay anonymous even when he or she access the internet and social media all the, The world we live in right now revolves around internet and social networks, not being connected to the internet is like not being in this world.
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 ?