I think Harrison Ford can see the end of life, or at least the end of his acting life before him and is trying to create as much art as possible as long as possible before he hangs it up.
Good on him. The original Indiana Jones is one of my favorite movies of all time. I hope this new one can live up to the franchise legacy, something I don’t think has happened in at least one previous reincarnation. Crystal Skull **cough, cough**
I wish River Phoenix wouldn’t have died. He could have kept things going.