All of this is going to make wars far more politically acceptable in the future..... until they turn into bloody mudslogs.
Definitely, this was the ideal 'short, victorious war' that every nation hopes for, and Germany has (compared to the victors OTL) paid very little for it. As such, the concept of aggressive, decisive war for political gain is just as strong, if not stronger than before, and there's been nothing to dramatically shift the balance of power in Europe. The same alliance structures and the same economic, cultural, and political forces which lead to war here are still in place; all this war has done so far is set up for another one as soon as conditions allow.
Moreover (and apologies if this has been covered upthread, I admit I've only skimmed a lot of the between-posts discussion), the next war will be just as brutal as OTL WWI, because the conditions that led to trench warfare haven't changed, and the technological and tactical innovations which rendered it obsolete it only came about in reaction to it. Germany got lucky here, and the nightmare of the trenches hasn't been avoided. It's only been postponed.