The EU is NOT Germany's idea. The EU was Phase I for the globalists. And the globalists have not gone away.
Two things have hampered their efforts, BREXIT and Donald Trump. Even if Trump serves a second term, he goes away in 4.5 years. I believe the globalists will pick up from where they left off. It is about global control/domination, and they see the light at the end of the tunnel.
Even if Germany does bail, I foresee a Version 2.0. After WWI, we had the League of Nations, failed, and then after WWII, we had the United Nations. They will keep trying because we are talking about global domination.