I like to think Satoshi is alive. He put the 1MB block size limit, which made Bitcoin ultra-secure. I believe he didn’t realize at the time what this meant, but once he saw it, he decided to leave the core principles of Bitcoin alone.
This is why his wallet hasn’t been touched. Satoshi knows that Bitcoin is the greatest store of value in the history of mankind. Why would he trade his Bitcoin for fiat dollars?
I like to think he is still working to make Bitcoin better. He now uses his real name, and nobody knows that he is Satoshi. There are many reasons why he would want to keep his identity a secret. Mostly because it would make Bitcoin feel less decentralized (although there is absolutely no way to stop it’s decentralization at this point). This was the main downfall of all the internet money that came before Bitcoin. Adam Back talks about this in his interview with Robert Breedlove.
I hope Satoshi is making billions of dollars, and has no need to sell his Bitcoin because Bitcoin is the strongest property right humans beings have ever obtained.