I think he is moving to a simple life as he already had enough money to enjoy for the rest of his life.
With his btc owned, he can live financially free so he could already be satisfied with his wealth.
It's quite awkward knowing he just leave the responsibility to all of the people including us, with him living freely now and on the other hand, is quite an interesting idea to live your life knowing that you don't need to spend time in jobs after all you've done to bitcoin and all of the wealth you've obtained.
So, one good lesson from this is to always try and do our best to create something that will change the world. One season of great effort might turn the rest of our lives into full time vacation.