Bitcoin price fall : For the same reason than the above reflexion, seeing that Satoshi has moved its bitcoins will create a panic as never seen. Imagine what could be said. People could say that Satoshi is back, but his bitcoins too. Those bitcoins that were never put on the market could from a second to another being put to sell on an exchange, and considering how big his stack is, the fall will be hard
The price fall is not a given
Unless he actually starts wildly selling his bitcoins (and he has somewhere around 980,000 of them, just in case), the effect might be quite opposite, i.e. price might actually surge on the euphoria that peeps might feel when they find out that he is still alive and kicking. Or it may rise when he decides that he is going to become a benevolent dictator (like Linus Torvalds of Linux fame) and direct the development of Bitcoin from now on
He would be the target of greedy people wanting to acquire its bitcoins : I don't know how much bitcoins actually does possess Satoshi, but with just one million of bitcoins, he would be the proud owner of a fortune worth close to one billion dollars at actual rate, so of course people trying to kidnap him would be something common, if he's not simply killed
With all his wealth, he could just hire a couple of gorilla-sized bodyguards, and that would solve most of possible problems
Bill Gates is by far wealthier than him, but how often do you see him closely surrounded by bodyguards?
