Simply let him/her or them do whatever satoshi want... If satoshi wants to sell his bitcoin let him sell if he dumps the price price will dump and recover over some period of time. But honestly if satoshi is still alive or whatever I dubt that we are going to see movments from those coins as with the transparent nature of bitcoin many people are watching closly on that wallet and if bitcoins are moved many will try to get the identity behind the creator of bitcoin. Given the fact that satoshi wanted to stay anonymous I dubt that we are going to see this.