I think the coherence of Western and middle Europe must be preserved as a counterpoint to Russia and as a United entity against aggressive Islam.
If the union breaks up then Vladimir Putin will be in a position to pick off nationstates much like China has evidently just picked off the Philippines. Please do not mistake me, the European Union is in desperate need of political reform but so long as it speaks, at least ostensibly, in one voice concerning foreign affairs the influence of an aggressive Russia can more easily be fended off.
As to the reform of the European Union, the socialist mentality here makes it difficult to expect either political or economic reform which I define mostly to mean a restructuring of the architecture of the European Union. The problem is, it is run by leftists who love bureaucracies, who themselves are bureaucrats, who rule Europe according to the bureaucratic fashion. This will be a tough nut to crack.
I agree with your position that American should be neutral concerning the makeup of the European Union and trade opportunistically which is, after all, the policy of the founders and framers. We should not, however, be neutral respecting Islam or Russia. We should co-opt Russia if possible.