This is basically a no-WW1 scenario then. A-H won't fight Russia without Germany's backing, so you'd get an acceptance of the Serbian response. The July Crisis becomes one more in a long list of war scares.Not necessarily, I would like to know what happens if Germany avoids going to war because of a Serbian terrorist.
What the world looks like in the medium or long terms is anyone's guess; no OTL WW1 means an unrecognizable 20th century.
Care to provide any examples of the French government of the time actually doing anything analogous to this? Funding terrorism and assassinating foreign heads of state is not as simple as you're making it out to be, and I would question whether or not the French state actually has the organizational capability to do that. Likewise, Russia "riling up the Poles" is extremely unlikely, considering where most of those Poles live.A scenario if you will. France fund an assasination attempt on the Kaiser. The French fund terrorists in Alsace. The Russians rile the poles up against Germans and give weapons and funding. What can Germany do except sit down and take it. If France wants war there’s nothing easier than convincing a few Frenchmen to be willing or unwilling martyrs for the cause and have France step in to protect Frenchmen in occupied territories by demanding Alsace loraine.
Granted, I don't think the scenario of Germany carving up A-H in 1914 is remotely plausible since the Dual Alliance was quite strong and the German elite feared being alone in Europe without A-H.