[greedo]

Nationalism was coming alive as a powerful political force in the second decade of the 20th Century, so it's hard to estimate what would have happened had Princip missed. Odds are the Black Hand would have simply kept trying to kill the King as a means of obtaining independence.

Even had the Balkans not been the powder keg, I think there was not much doubt that there would be a conflict on the Continent between a unified Germany and either Russia or France. Germany was trying to compete for colonies, for resources, and even without the web of treaties that lead to WW1, would have found a reason to flex their muscle.