The days of getting Tesla and Twitter CEO's autograph appear to be over after telling autograph seekers at Dulles International Airport Saturday night, "To be clear, I'm not doing anymore autograph signings ever again." This comes after saying that the threat of him being assassinated is very high and a legit threat. His security detail is quite present in the video, showing that he's taking threats very seriously.



So what has changed? His recent acquisition of Twitter and changes…