If Satoshi comes out of his anonymity and sells all his Bitcoins I would be happy.
First,Satoshi is still alive.
Second,the Bitcoin price will drop,which means cheap Bitcoins for everyone.
Third,the 1M Bitcoins,that Satoshi holds will be re-distributed across multiple small and medium-sized HDOLers,which means that Bitcoin price fluctuations will no longer depend on the decisions of one person.
Anyway,I don't believe that Satoshi Nakamoto is ever going to sell his 1M coins.
At this point in time, I think Satoshi is either dead or waiting for the right moment to move his/her/their Bitcoin. It's probable that Satoshi is dead, considering that it's been a long time since we've last heard from him/her/them. What will happen with the dormant Bitcoins is a mystery. There's fear that the large stash of Satoshi's Bitcoin holdings could plunge the cryptocurrency's price over the short term. Whenever Bitcoin will recover after that, it's yet to be seen. Whales would probably buy as much cheap Bitcoin as they can, effectively rising the cryptocurrency's price on the market at a fast pace.
What's important right now is not Satoshi, but rather the longevity of Bitcoin as a decentralized cryptocurrency for the world. As long as there's a community supporting it every step of the way, there should be nothing to worry about. At this pace, it seems to me that Bitcoin will last for many years. This wouldn't be possible if Bitcoin was a centralized cryptocurrency like other failed projects before it (Ecash, Bit Gold, etc.). With or without Satoshi, Bitcoin will be here to stay. Just my opinion