Of course, besides Franz Ferdinand becoming Emperor of Austria-Hungary, we also had a similar situation several years later where where Japanese Prime Minister Hara Takashi narrowly missed being assassinated in 1921 (the assassin, Nakaoka Kon'ichi, didn't realize the floor at Tokyo Station had just been cleaned and waxed the morning of the assassination attempt and when Kon'ichi-san attempted to stab the Prime Minister, he slipped on the floor and ended up stabbing a one of the guards with the Prime Minister's entourage in the right shoulder).
It's been said that this narrow miss altered the course of Japanese history as much as Franz Ferdinand's narrow escape in 1914. It was during the trial of the attacker that we found out about the plan hatched by a number of high-ranking generals in the Imperial Japanese Army to make the country more "militarist," and that resulted in a huge purge of IJA officer corps, including six generals tried and executed for hatching the plot to use Kon'ichi-san to kill the Prime Minister. Today, the Imperial Republic of Japan--as the Empire of Japan was renamed after the Second Great War--has six Home Islands (Honshu, Hokkaido, Shikoku, Kyushu, Taiwan and Karafuto), the Kuril Islands, the Ryukyu Islands, plus various small islands to the south of Tokyo.
All I know is that there was a huge diplomatic row over Franz Ferdinand's narrow escape. The Russian Imperial Court immediately disavowed any connection with the radical group that plotted to kill Franz Ferdinand (nobody believed that fried bologna sandwich, as the old American English expression goes), and we found out much later that agents of the Russian Imperial government were quietly funding and training the Black Hand group that wanted Franz Ferdinand dead. Like Hara Takashi's narrow escape I mentioned earlier, Gavrilo Princip, the assassin that could have killed Franz Ferdinand and his wife, failed because the pistol he used jammed attempting to fire the first shot, and two bystanders jumped him before he could attempt to fire the pistol again. In this case, a manufacturing defect with the Belgian-made FN 1910 pistol literally changed the history of the world.