Rather like this sort of discussion, if only for the details that crop up.Imagine no WWI. Does that mean there would have been no Russian Revolution? Would the Czar still be on the throne in the Russian Empire and would Buckingham Palace be exchanging friendly greetings with their relatives in St. Petersburg? Would the Kaiser still be on the throne in Berlin? Would the Austro-Hungarian Empire have held together, or would it have gone through a long and bloody civil war with outside powers alternately intervening or standing aside and tut-tutting?
Imagine no WWII, which may in itself have been a consequence of no WWI. Would there have been no Cold War? Would there have been no Communist Revolution in China? What would have happened to the European colonial empires which controlled most of the world?
This makes for rather interesting speculation, but I doubt that we could ever really know the answers. Imagining the immediate consequences of something is possible, but we would have a difficult time imagining the secondary and further consequences of those changes. For example, if the Bolsheviks in Russia were successfully suppressed due to there being no WWI to weaken the Russian state, would the Marxist problem have simply cropped up elsewhere, possibly in a Central Europe that was undergoing its own internal cataclysm in the breakup of the Austro-Hungarian Empire? What effect would that have had on world history?
These are questions that are probably better left to another thread, but it shows that while I believe that technological development would have remained more or less the same, the political and diplomatic world in which that technology existed could have been almost unrecognisable to us today.
I don't know the globe-spanning interrelationships well enough to say anything credible; however, I expect the Marxists cropping up in Central Europe, as a faction in the already heartily factionalized Austro-Hungarian Empire, wouldn't have been able to achieve the same global momentum as when in control of Russia.
Equally, I wonder if (perhaps assuming a Communist or otherwise unfriendly Russia) more adept handling of the Japanese at some earlier stage might have avoided the Pacific war: "we won't contest anything you might grab that isn't already colonized, feel free to do what you want with China, Siberia, Mongolia, etc., and by the way we'll sell you all the oil you want at Most Favoured rates."
Finally, no WWII, perhaps the southern neighbours would've continued with the New Deal and related measures, rather than, first, having to focus on a global war, and then becoming allergic to anything remotely socialistic after that war.
Looking forward to seeing comment from the better informed!