This is a hypothetical question. But what if he actually did send his Bitcoins to an exchange? Will they sky rocket past the moon, or bumble down as weed.
Who can really predict which wallet is satoshi's wallet?? I am sure his bitcoins are spread among thousands of different addresses which are surely untraceable as every btc address is anonymous. How can we say that even until now he hasn't moved a bit out of it?? I am sure he must be moving something to pay off some bills for sure. But yes if people get to know such a thing they would just be blindly dumping the whole crypto.