The Serbian and Russian culpability for Franz Ferdinand assassination and the general malaise of state-sponsored terrorism is unjustifiably ignored. Austria's "ultimatum" likewise is overly exaggerated, likely due (again) to Entente Propaganda. Frankly Speaking I hold Russia to be the most culpable of the involved great powers; as the most directly revisionist (unlike Grrmany, A-H and to an extent Britain, which largely were satisfied with the starush quo) and expansionist towards the balkans, with a longstanding policy goal of annexing the straits (which has many parallels with Soviet and contemporary Russian policies.. they established an environment where in the Serbian government felt as if it could actually with impunity. Russias allies- Britain and France- encouraged this adventurism for their own goals, France for her revan check Britain because a European oriented Russia is a Russia that does not challenge her in Asia. The Czar likewise found, post russo-Japanese war, that the Balkans were the natural outlet for his ambitions. Russian mobilization was ultimately yhe trigger for the conflict; Germany, under obligation to defend her ally from unwarranted Russian aggression. Russias intervention in the Serbian conflict was a highly dubious and "criminal" act in and of itself, and far and away the single most direct cause of the conflict's escalation. Whether or not the Sarajevo band were directly tied to the Serbian state, the Serbs had deliberately aided and abetted nationalist groups at an arms length, precisely to have their cake- a nationalist war of "liberation" and eat it- have plausible deniability when something like the assassination occured. Austria refusing to allow Serbia to maintain sole oversight of the investigation was entirely warranted, indeed Austrian demands werected not less harsh than the NATO demands levels to yugoslavia prior to the 1993 intervention, and again the depiction of the poor Serbs unjustifable subject to Habsburg yoke is a decidedly slanted view of the events of 1914.
German "miltiarism" is IMHO overstated. Germany was no more or less nationalist or sanguinary about the prospect of war as any other great state of the time, nor any more or less guilty of leveraging her power to force the arms of lesser nations, Belgium included cf Greece or Versailles annexations in the Levant. Great powers do as they will, and have done so since the days of the Athenians and Medes; for the likes of Great Britain, at the height of her empire, to decry German imperialism is rank hypocrisy.
To the extent that a revanchist German government would invariably seek annexation in the east and union with Austria the potential for conflict remains regardless of the regime in Bslrin- indeed a republican government would probably be even less compromising with Poland. However as this government would be (presumably) more "reasonable" in its demands the lead up to war might be avoided, as the Anglo sphere countries in particular felt that Germany was (justifiably) seeking her due as part of the European community. Hitler exploited this feeling of regret over Versailles as well as general reluctance to engage in another round of bloodletting to extract his initial demands.