If Satoshi is still alive (I believe it's a single guy), then it's incredible the amount of self-control he has to not reveal his identity after all these years. Not needing the wealth or the fame and ego-stroking that comes with being behind such a revolutionary technology is enviable.
Not many people are like that.
If he is still alive and just moved on to other things as he said, I can't applaud that kind of personality enough.
If I were Satoshi I'd keep my head down. I wouldn't want my life f-d up by outing myself.
Think about the kind of world view you need to have to decide to dedicate the necessary time to develop a system for transacting outside of approved channels. Dude's probably worried about polonium finding its way into his tea or whatever.
You probably won't get killed, but of course you might by someone looking to make a point, in any case your life is gonna get turned upside down, various interests are going to want you to do things for them, people will want to hire you to say things or confer them legitimacy, people will want you to opine on things, etc.
If you're in a nice enough place to dedicate the time to a project like Bitcoin is that something you really need? If you have sufficient frame of mind to develop Bitcoin that's probably not something you want in the first place.
One factor is that it's known that he controls the wallet with many billions of dollars in it. That would make him a target for kidnapping/extortion/etc. He could have easily kept mining under a different address though and become very wealthy aside from the main wallet.
Wealthy people are notorious for having a ravenous desire for more wealth... It's often the mindset that made them wealthy in the first place - unless they inherited it, and even then.
Not many people are like that.
If he is still alive and just moved on to other things as he said, I can't applaud that kind of personality enough.