As long as we're speculating wildly, I have a theory... (Bear with me now) It is possible, if not probable, that Ted Nelson is himself Satoshi and was only trying to throw everyone off the trail (or it's Adam Back, I can't be sure, but it's definitely one of the two, if not both...).
I love the Satoshi speculations a lot, I think Bitcoin is awesome enough as it is, but to add that the creator is unknown just makes the story even more compelling.
If Bitcoin does take off or a derivative based on Bitcoin, it will be weird having this anonymous guy as the creator. Most computer science history has no large mystery like Bitcoin will have. (If Bitcoin is still around in a decade or more)
It's funny, of all the William Gibson imaginings that have found their way into real life, Bitcoin is probably the most purely Gibsonian, in its plotline of the anonymous, genius creator of some earth-shaking thing whose identity is the stuff of legendary speculation.
Makes me wonder if there's a Bigend out there with a crack team of Satoshi researchers on a globetrotting adventure...
With millions of dollars piling into bitcoin, both via startups and via direct purchase of coins on the markets, it does seem likely that someone somewhere has put a "due dilligence" team on the case.
Assuming that Satoshi remains anonymous. It is entirely possible that he could out himself at some point in the future, or be outed by friends/family/collegues after he died (or before).
Theres also the speculation that Satoshi is not an individual, but rather a government or organization. In this case, there are almost defiantly written records of 'who' he is.
http://www.cypherspace.org/adam/
As long as we're speculating wildly, I have a theory... (Bear with me now) It is possible, if not probable, that Ted Nelson is himself Satoshi and was only trying to throw everyone off the trail (or it's Adam Back, I can't be sure, but it's definitely one of the two, if not both...).