I'm not sure for the return of the genius brain - Satoshi. But let's say, he does keep an eye on the bitcoin value market at this point. Surely he wouldn't because the natural child he devoted himself to creating has actually changed the way the world sees it - a trillion-dollar asset.
I think, He will continue to remain anonymous or will continue to develop bitcoin silently and hope that he still exists among us.
*I want to say thank you and congratulate Sir. Satoshi!*