A key strategic question is whether Germany still relies on Euro & EU markets for its exports or can rely on China et al.
Different exporters in Germany and the rest of the Eurozone17 have different geo-strategic trade interests: Some prefer the Eurozone, some the opportunities in China et al, etc!
For a large % of Eurozone export & other firms, a EU exit from the WTO would be a blessing (inter alia, it would curb Chinese exports to the EU and its Eurozone that compete with many made in Eurozone products) . For many, a curse.
Of course, in that scenario, EU trade would be conducted on the basis of existing or new bilateral agreements of the EU with countries (China, USA, India) or groups (eg Mercosur, ASEAN etc)
Which interests will prevail in EU trade as well as other policies (eg the implicit exchange rate policy of the Euro)?