We can probably make an interesting timeline, but first we will need to stop it with set-in-stone theories of A didn't happen, so B, C and D. Let's go back to the start:
What triggers WW1? Assassination of the Arch-Duke. What changes in this timeline? The Duke's driver simply takes a different turn and the attempt is foiled.
Where are we now? Duke is alive, however, the attempt still happened. How does the AH government respond?
For my 2 cents, they can go the Ottoman route, and violently suppress the Bosnian nationalists, to the point where they are no longer a threat. Many civilian casualties. Bosnian refugees fleeing to Serbia. What happens next?
Ignore the assassination, all it needs to trigger is someone attacking a radio station!