There is a very high probability that Satoshi will never sell off his Btc. If he ever does, then we are all doomed, that may act be the end of crypto. Besides no ones know who Satoshi is and whether he is alive or not. We have more important things to be worried about right now. A whale wallet holding about $1B worth of Bitcoin has just come alive, the wallet was said to be associated with the Silk Road scandal. Check out the full story here:
http://www.investing.com/analysis/1-billion-silk-road-bitcoin-whale-active-should-investors-be-concerned-200342252