Even if he didn't he should know that everyone here will want him to sign a message. He has a PGP key and several Bitcoin addresses that are known to be owned by him. Just by reading any of the "I am Satoshi" threads around and the posts in this thread and other threads as well as replies to the mailing list,
Satoshi should know that in order to be taken seriously as Satoshi, he must sign something saying that that was him.LOL. I bolded the part that doesn't make any sense. Is it so hard to accept someone's identity who they say they are without putting some kind of artificial control over it? This isn't a game. The burden is going to be on those early adopters, core devs, Gavin Andresen, etc., to personally verify Satoshi's identity. Otherwise, it's all smokescreens and coups and cover-ups. It's kinda embarrassing.
Eastfist, when you say that the burden is going to be on so-and-so to verify Satoshi's identity,
it is precisely by demanding a signed message from Satoshi that such an identification would be achieved. I can't think of any more solid way to do it, and EVERYONE who has a grasp of digital signatures will be forced to accept it, or that Satoshi has lost control of his private keys (which so long as he lives is pretty darn unlikely.)
We are all expecting a signed message from any valid communication from Satoshi. And he _must_ know this. So don't be surprised when we are completely dismissive of any claimed communication from Satoshi that lacks the signature. It's a fake.
I would take it as a highly personal insult if the people who supposedly help create this technical "tour de force" couldn't voucher for my existence, who support who I said I was. Does that make sense? I'm using logic here. This isn't a game. It only takes some honest witnesses.