I'd make Archduke Ferdinand's coach carry him a different direction. No WWI means no WWII.?

It was pure luck the assassin was standing on the street corner when the Archduke's car was turning. Princip had given up and was on his way to get something to eat when the Archduke's care stopped almost in front of him.

You have to keep in mind, the assassination wasn't the root cause of the war. It simply sped it along it's way. Something else would have sparked the war because tensions were so high.

The assassination of Archduke Ferdinand was merely an excuse for Austria-Hungary to go to war with Serbia. - Had he not been assassinated, they would have found another excuse to invade Serbia and start WWI.

Be nice to think so, but altering one moment in history is no guarantee of a permanent deviation.

If it worked than good on ye