Yeah, weird to think how the Entente, having seen how the over-expansion of Austria-Hungary led to Čabrinović blowing up its Archduke and subsequently the most devastating war in history, chose to fix things by basically making exactly the same mistake! France and Russia chose to incorporate swathes of ethnically German land, while Italy took the same Balkan territories where the whole affair started, and more than their fair share of Austria to boot! And of course, this farce of a "peace" that came about at Trianon lasted barely a decade before the 2nd War of German Reunification that casts long shadows over the world to this very day.
Now, there are different extents of leniency which could have been shown to the Central Powers. Russia getting Prussia and Constantinople was surprisingly (and worryingly) a last-minute addition to the terms of the Treaty of Trianon, after the Tsar threw a hissyfit over Britain getting basically all of the Middle East. If that clause gets undone, a lot of angry Germans get a little bit less angry, and the odds for such a bizarre series of events as the 2WGR coming to pass get ever steeper. Similarly, say the Alsatian Uprising doesn't happen during the Armistice period, and so France feels more secure having a direct border with Germany. As such, they don't annex the Saarland and set up that wacko Rheinland Protectorate, which once again soothes things in Germany quite tremendously.
When it comes to Italy, them switching sides in 1916 was pretty much dependent on Rome getting the full English (or rather, Austro-Hungarian) at the Peace Conference, so I'd be highly surprised if they'd settle for anything less than what they got. Of course, with the benefit of hindsight one can see the idiocy of resolving a war caused by Balkan resentment of an occupying empire by simply transferring occupation to another empire, but the mindset of Western politicians at the time was that the Great War was focused first and foremost on the 'Germanics', and that even though the fight started in Sarajevo, in the end the South Slavs were basically cannon-fodder. So a nicer demarcation between Italy and Austria-Hungary isn't happening. Same with Romania, if anything it's surprising that Bucharest didn't get more!
As for the Ottomans, they were lucky enough to survive as that rump-protectorate thingy until the Turanist Coup of 1937. There was talk of simply dissolving the state full stop and giving every single minority independence or constituent status in someone else's empire, mirroring the whole issue with Italy. In the end, Britain simply sweeping up Arabia was probably the best
