By being part of the EU, they have abrogated that voice. However, there isn’t a single politician in Germany that wants the EU to go away, even the so-called “euroskeptic” ones.
Almost everything that’s happened since the end of WW2 has benefited Germany. They’ve grown fabulously wealthy while shouldering no responsibility for their own defense and while accepting no global obligations apart from their own business dealings. It’s time for Germany to step up to the plate.