The big question is: as much as it is impossible to imagine, could we see another European war? Not outside forces invading Europe, but a war among the European nations? Tomorrow? next year? 10 years from now?
The Europeans of 1900 (also) thought it impossible.
Just to de-rail this thread further
I don't see it happening at least in Western Europe per say (England, France vs German). I however do believe that it is only a matter of time that there is a small regional conflict in Europe, and that would be back in the Balkans. Of course that will draw the majority of European nations into it again, but probably in the form of Peace Keepers.