WWI started traditionally as yet another duel between powers that had duelled so many times before and in that context probably would have started some time or another anyway. But to have a WWII anything like the OTL one it need to drain also the victors pale. We have on this board have had many exampes of plausible PoDs giving an early and clear victory (one of my favourite sbeing the Russians taking Berlin in 1915) but anyway pushing the "inevitable" WWI by some years will alone be significant. If happening in 1905, not that unlikely, France will probably be run over before you can say "guano". If happening in 1923, Germany will probably see Russians in Berlin before Christmas. In each case the most significant PoD probably will be the absense of OTLs pacifism and modernism - the belief in God, King and Country (or whatever it is called around the world) is unshaken - la belle epoche goes on.
Already this will prevent a WWII type of conflict, as a Germany type of upstart probbaly never will be allowed past the reoccupation of the Rhineland and certainly never with Anschluss or Munich as Mussolini will not be allowed past Abyssinia or Japan with her China policy.
It will certainly not be a peaceful world, there will be plenty of wars, a lot of civil wars and revolutions too, but as long as they don't end in the total carnage of WWI the old regimes/Empires will stay in power. But WWI being fought in 2014 and with nuclear weapoins might have the OTL one appear merciful. Another TL might be one of the old Empires gradually dominating Europe and its overseas possession while USA simultaneously develops its strength. That is bound to end in a World War, but my guess is a mainly naval war and thus probably without the cruelty and carnage of the OTL world wars - unless of course it is fought with ICBMs and nukes...