There's a high likelihood that "Satoshi Nakamoto" is a group of people and the pseudonym doesn't belong to one single person.
Plus - if he was ever going to come out from under his bed - it wouldn't be to sign a message to you.
What makes it a high likelihood? I know it's possible that it isn't just one person, but haven't seen any high evidence for it.
Multiple news outlets have done research and all of the potential "Satoshi Nakamoto(s)" were groups of people.
It'd be too difficult for one person to create this - proficiency in networking, programming, security, economics, etc...
And if one person did do it, it would take
years.
It seems more likely "Satoshi Nakamoto" is a pseudonym for multiple people.