Considering how well Bitcoin is able to handle itself, and how carefully the halvings are planned up to the year 2140, I wouldn't be surprised if Satoshi is indeed a time traveller. So he went back to 2009, created Bitcoin, mined about a million of them for himself, and went back to his own time. The big question now is when that is! It could be years or even centuries from now that his old Bitcoins start moving to new addresses.
If your theory is time travel theory, it has a giant hole 
Dive into your story, if Satoshi comes from the future, he goes back to 2009 to create Bitcoin. So, at his point in the future (2140), who created Bitcoin for him to realize that Bitcoin could be so profitable? And if he is the one who created Bitcoin in the past, he doesn't need time travel. On the contrary, if he wasn't, where is the person who created Bitcoin in his past? How are they interchangeable?