Germany is certainly not going to be a military threat by itself. No, the path towards militarism in Europe can only go through an European Federation. The smaller individual countries would not dare launch any big war. That is part of what I like about europe being a continent of many relatively small nation states. European countries in a loose alliance are more than strong enough to defend themselves now, without putting a burden on the population with foolish imperial projects. But united as a single state the future leaders of that state will get ambitious. That is one of the reasons why I don't want a future where there is one big european super-state looking to get its "place in the sun" in a new world order.
Fortunate the EU is so dysfunctional already that the ambitions which do exist of creating an european army and carrying on the "common foreign policy" (already in the treaty!) stand little chance of being applied. As usual the "fathers of the EU" bit more than they could chew. They want it though: the whole rationale behind the goal of ever-tighter integration is a big single state that can be a world power, with everything that implies.