The Great War of OTL would be avoided- but a Great War might still start at about the same time and in about the same place, as Austria-Hungary still has the attempted assassination of the heir by that Serbian organisation to become angry about.
The survival of Franz Ferdinand and wife might lead to diplomacy solving this crisis, though, as it did for the previous ones. Just need to keep doing that for some time (a decade or two, maybe) to avoid a Great War similar to ours.